Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Middle Ordovician-Lower Mississippian
Kinds of fossils: Conodonts
Quadrangle or area: Chandalar B-4, B-6, C-5,C-6, D-4, D-5, D-6, Philip Smith A-4, A-5, Wiseman B-1, C-1
Shipment No.: A-90-4b
Referred by: Dumoulin, Julie A. , Moore, Thomas E. , Blodgett, Robert B. , Nokleberg, Warren J. , Till, Allison
Report prepared by: Harris, Anita G.
Date: 04/05/1991

All sample and residue weights are given in a table at the end of this report.

The age range (in relation to the Frasnian conodont zonation) early Late Devonian samples is also shown on a chart at the end of this report.

Twenty-six of the 62 samples were barren; I suppose this is to be expected when your down to rocks of last resort.

User Note module to be added
90ABd28 , Chandalar , Brown-orange-weathering, dark gray, recrystallized lime mudstone with orange argillaceous partings, locally containing tabulate corals, syringoporoids, and crinoid ossicles. Collected from uppermost beds on east side of quarry on east side of haul road, 0.5 mile east of Dietrich River, approximately 1.25 miles west (and slightly south) of peak 3760 ft; sec. 16, T. 35 N., R. 10 W., lat. 67 deg. 51.1 min., long. 149 deg. 49.2 min., Chandalar D-6 quadrangle. Submitted as Ordovician "OSm", but mapped as "Skajit".
7 Panderodus sp. indet. elements fragments
1 indet. bar or blade fragment
90ABd29A (12062-SD) , Chandalar , Massive, dark-gray, recrystallized lime wackestone locally containing corals and brachiopods. Collected from outcrop on north side of small unnamed stream that flows into Dietrich River, 0.75 mile east of Dietrich River and haul road, approximately 0.5 mile north (and slightly west) of peak 3990 ft., and 2 miles north of Nutirwik Creek; sec. 11, T. 36 N., R. 10 W., lat. 67 deg. 57.5 min., long. 149 deg. 20.6 min., Chandalar D-6 quadrangle. Sample submitted as Frasnian based on megafossils present in rock. Mapped as "Skajit" by Brosge? and "Beaucoup Limestone" by Dillon.
1 Pa element fragment of Polygnathus sp. indet. (generalized from of Givetian-Famennian morphotype)
8 indet. bar and blade fragments
90ABd29B (12063-SD) , Chandalar , Rubble block near 90ABd29A with same lithology and megafossils but, contains mottled, orange argillaceous seams.
1 polygnathid(?) Sb element
1 Pb element of a digyrate apparatus
2 indet. conodont crumbs
90AD20G (10828-CO) , Chandalar , Dark-gray-weathering, black, finely crystalline, partly dolomitized metalimestone, and bioclastic wackestone containing halysitid corals and pelloids?. Collected near 90ABd31, 32, 33; north of fault slide on ridge extending south (and slightly west), approximately 0.5 mile south of peak 5405 ft., 3 miles east of Nutirwik Creek, 0.5 mile north (and slightly east) of peak 4975 ft., sec. 26, T. 36 N., R. 9 W., lat. 67 deg. 54.8 min., long. 149 deg. 31.4 min., Chandalar D-6 quadrangle. Submitted as Ordovician "OSm".
13 "Drepanodus" spp. indet. elements
2 drepanodontiform fragments.
58 Panderodus spp. elements
Phragmodus n. sp. (=Phragmodus undatus Branson & Mehl of Moskalenko, 1983)
Plectodina aff. P. dolboricus (Moskalenko)
100 indet. bar, blade, platform, and coniform fragments
90ABd31 (12064-SD) , Chandalar , Dark-gray, crinoidal lime, packstone/wackestone with "two-hole" crinoid ossicles. Collected in fault slice just south of fault zone, in saddle on ridge extending south (and slightly west), and about 0.5 mile from peak 5405 ft., approximately 3 miles east of Nutirwik Creek, and 0.5 mile north (and slightly east) of peak 4975 ft; sec. 26, T. 36 N., R. 9 W., lat. 67 deg. 54.8 min., long. 149 deg. 31.4 min., Chandalar D-6 quadrangle. Submitted as Emsian-Eifelian age based on "two-hole" crinoids.
4 Panderodus sp. elements
1 Pb element of an ozarkodinid of Silurian-Middle Devonian morphotype
2 indet. bar and blade fragments
90ABd32 , Chandalar , Medium-to thick-bedded, dark-gray to black, coralliferous lime wackestone containing numerous calcite veins. Collected just south of 90ABd31. Submitted as possibly Silurian or Devonian (based on complexity of corals present in the rock).
90ABd33 , Chandalar , Dark-gray, lime mudstone in blocks containing lenses of silicified halysitid corals. Collected in saddle south of fault slice on ridge extending south (and slightly west), and about 0.5 mile from peak 5405 ft, approximately 3 miles east of Nutirwik Creek, and 0.5 mile north (and slightly east of peak 4975 ft; sec. 26, T. 36 N., R. 9 W., lat. 67 deg. 54.8 min., long. 149 deg. 31.5 min., Chandalar D-6 quadrangle. Submitted as Ordovician-Silurian "OSm" of Dillon.
6 Panderodus sp. elements
10 indet. bar and blade fragments
90ABd34 (12065-SD) , Philip Smith Mts , Allodapic, orange-brown-weathering, limestone bed containing solitary and rugose corals, rip-up clasts, and dark-gray clastic grains in dark-gray shale section. Collected from 1.5-ft.-thick bed in small unnamed tributary of Dietrich River, approximately 2 miles southwest of Atigun Pass, and <1/8 mile west of haul road; sec. 26, T. 15 S., R. 11 E., lat. 68 deg. 06.9 min., long. 149 deg. 32.2 min., Philip Smith A-5 quadrangle. Submitted as Upper Devonian Huntfork??? limestone member.
10 Pa elements of Polygnathus pacificus Savage & Funai
2 Pa element fragments of Polygnathus aff. P. planarius Klapper & Lane
2 Pa element fragments of Polygnathus aff. P. samueli Klapper & Lane
38 robust Pa element fragments of Polygnathus spp. indet..
UNASSIGNED ELEMENTS (most undoubtedly are part of the Polygnathus apparatus)
61 indet. bar, blade and platform fragments
2 ichthyoliths
2 conodont or bryozoan pearls
90ABd35 (12066-SD) , Philip Smith Mts , Thin-bedded, dark-gray, nodular lime mudstone in shale sequence containing gastropods. Collected from 6-foot-thick unit just west of 90ABd34, sec. 26, T. 15 S., R. 11 E., lat. 68 deg. 06.9 min., long. 149 deg. 32.2 min., Philip Smith A-5 quadrangle. submitted as Upper Devonian Huntfork??? limestone member.
1 Belodella sp. indet. element
7 Pa elements of Polygnathus aequalis Klapper & Lane
1 Pa element of Polygnathus cf. P. n. sp. F of Klapper & Lane (1985)
7 Pa element fragments of Polygnathus spp. indet.
UNASSIGNED ELEMENTS (probably all belonging to Polygnathus)
78 indet. bar, blade, and platform fragments
90ABd37A (10267-SD [note by RBB, this may be a mistake, is it 12067-SD?]) , Philip Smith Mts , Thin-waby-bedded, argillaceous lime, wackestone/packstone containing numerous corals. Collected from bed within sandstone interval above shale section west of 90ABd35, 0.25 mile west of haul road; sec. 27, T. 15 S., R. 11 E., lat. 68 deg. 06.9 min., 149 deg. 32.5 min., Philip Smith A-5 quadrangle. Submitted as Upper Devonian Huntfork??? limestone member.
5 Pa elements of Polygnathus evidens Klapper & Lane
37 Pa elements of Polygnathus of the P. xylus group (cf. P. alatus Huddle)
Unassigned elements: 8 Pb (+3 morphotypes), 6 M (+2 morphotypes) & 12 Sc (+3 morphotypes)
66 indet. bar, blade, and platform fragments
Abundant ichthyoliths, phosphatic brachiopod fragments, and phosphatized gastropod and bryozoan steinkerns
90ABd37B (10268-SD [note by RBB, this may be a mistake, is it 12068-SD?]) , Philip Smith Mts , Medium-bedded, dark-gray, pelloidal? grainstone. Collected from 30-cm-thick bed 15 ft. stratigraphically above 90ABd37a.
6 Pa elements of Polygnathus of the P. xylus Stauffer group
1 Pa element fragment of Polygnathus sp. indet.
4 indet. bar and blade fragments
90AD1A , Chandalar , Light- and dark-gray (weathering and fresh), irregularly, coarsely mottled (bioturbated?), fetid, pelloidal? dolostone forming rubble crop consisting dominantly of gray, medium crystalline marble. Collected from top of peak 4750 ft., 1 mile west of Mule Creek, 0.5 mile north of Limestone Creek, and 2.5 miles east of Matthews River; sec. 7, T. 32 N., R. 8 W., lat. 67 deg. 36.6 min., long. 149 deg. 25.0 min., Chandalar C-5 quadrangle. Submitted as Silurian-Devonian "Skajit" Formation.
90AD2A (12069-SD) , Chandalar , Pink-to orange-weathering, dark-gray to black dolostone locally mottled (bioturbated) and containing brachiopods and other skeletal material. Intercalated with dark-gray, finely crystalline marble locally containing crinoids (=sample 90ANK023A). Collected from west side of 4200 ft. elevation and knob, 1.75 miles east of Matthews River, and 1.25 miles west of Spruce Creek; NE1/4 sec. 29, T. 33 N., R. 8 W., lat. 67 deg. 39.5 min., long. 149 deg. 23.7 min., Chandalar C-5 quadrangle. Submitted as Silurian-Devonian "Skajit" Formation.
Kockelella sp.indet.
14 Panderodus sp. elements
1 S element of Pelekysgnathus sp. indet.
2 Sc (2 morphotypes) unassigned elements
4 indet. bar and blade fragments
90ANK023A (12070-SD) , Chandalar , Dark-gray, finely crystalline marble locally containing crinoids. This rock type is intercalated with rock type collected at sample 90AD2A. Collected several meters above 90AD2A, on west side of 4200 ft. elevation and knob, 1.75 miles east of Matthews River, and 1.25 miles west of Spruce Creek; NE1/4 sec. 29, T. 33 N., R. 8 W., lat. 67 deg. 39.5 min., long. 149 deg. 23.7 min., Chandalar C-5 quadrangle. Submitted as Silurian-Devonian "Skajit" Formation.
3 Panderodus sp. indet. element fragments
3 Pelekysgnathus? sp. indet. S & M elements
2 indet. coniform fragments
90AD5B (10829-CO) , Chandalar , Medium-dark-gray, finely crystalline metalimestone in undulatory 3-10 cm-thick layers, rarely containing white crinoid columnals? and other bioclastic debris. Collected from 4600 ft elevation on north-trending ridge, 1.75 miles due west of Big Spruce Creek, 1.25 miles east of Matthews River, and 2 miles north (and slightly west) of peak 4737 ft.; sec. 20, T. 33 N., R. 8 W., lat. 67 deg. 40.5 min., long. 149 deg. 24.8 min., Chandalar C-5 quadrangle. Submitted as lower Paleozoic (Devonian or older) "Skajit" Formation.
5 Panderodus sp. elements
Plectodina sp. indet .....
...... or Aphelognathus sp. indet. 1 Pa, 2 Pb(?) & 2 Sb element fragments
14 indet. bar, blade, platform and coniform fragments
90AD5D (10830-CO) , Chandalar , Lumpy, 10-20 cm-thick layered, gray- and orange-weathering, dark-gray, very fine grained, calcitic dolostone locally containing abundant white spar-filled tubes (corals?, burrow?). Collected from 100 m south of, and slightly higher structurally and stratigraphically? than 90AD5B. Submitted as lower Paleozoic (Devonian or older) "Skajit" Formation.
4 Panderodus sp. elements
3 indet. coniform fragments
90AD6A , Chandalar , Fine to medium crystalline, 1-5 cm-thick, black, sooty metalimestone locally containing crinoid columnals; interlayered with mm-thick phyllite. Thicker and coarser crystalline beds of metalimestone have white, sparry crinoids? or other bioclasts. Collected from about 3 m above base of outcrop along west bank of Spruce Creek, approximately 100 m south of junction with unnamed creek, 1.3 miles west of peak 3240 ft., and approximately 2 miles due north of Bettles River; sec. 10, T. 32 N., R. 8 W., lat. 67 deg. 36.9 min., long. 149 deg. 18.7 min., Chandalar C-5 quadrangle. Submitted as Middle Ordovician "Obpm"?.
90AD11C , Chandalar , Massive, light- to medium-gray-weathering, medium- to dark-gray, finely crystalline, somewhat dolomitized? marble. Collected from a rubble crop at 3700 ft. elevation on Dillon Mtn., in saddle between peaks made of massive, color-laminated marble, 0.6 mile east of peak 4820 ft., 2.5 mile west of peak 4228 ft.; NE1/4 sec. 31, T. 33 N., R. 9 W., lat. 67 deg. 38.7 min., long. 149 deg. 39.2 min., Chandalar C-6 quadrangle. Submitted as early Paleozoic "Skajit" Formation.
90AD14A , Chandalar , Black, fine-grained, sootly metalimestone locally containing white, sparry, relict bioclasts; intercalated with gray to black, 0.5 cm-thick, phyllitic partings (phyllite is >90% of section). Collected from a 30 meter-thick unit between two massive marbles ("Skajit") in saddle at 4500 ft. elevation at the north end of Wiehl Mtn., 0.4 mile south (and slightly west) of peak 5027 ft., 0.7 mile north (and slight east) of peak 5115 ft., and 5.5 miles east of haul road and Hammond River; sec. 35 (almost in sec. 34), T. 33 N., R. 9 W., lat. 67 deg. 38.5 min., long. 149 deg. 32.0 min., Chandalar C-6 quadrangle. Submitted as Middle Ordovician "Obpm"?
90AD15A , Chandalar , Massive, light- to medium-gray-weathering with orange to beige blotches, dark-gray to black, finely crystalline, locally dolomitized marble containing dabundant mm- to cm-sized crinoids, and rarely recrystallized corals? and brachiopods?. Collected from cliff at 3500 ft. elevation, 1.5 miles due east of peak 5342 ft., 0.25 mile south of peak 3780 ft., and 4.5 miles due west of North Fork Chandalar River, sec. 20, T. 36 N., R. 8 W., lat. 67 deg. 56.1 min., long. 149 deg. 24.0 min., Chandalar D-5 quadrangle. Submitted as Devonian? "Skajit" Formation.
3 Panderodus sp. indet. fragments
90AD16A , Chandalar , Massive, medium-gray-weathering (locally orange), dark-gray to black, finely crystalline, slabby-foliated metalimestone rarely containing relict bioclasts (limey mudstone protolith?). Collected from a less laminated, 10-cm-thick layer at 3150 ft. elevation, approximately 1 mile east of peak 4633 ft., 1 mile southwest of peak 3005 ft., and 5 miles west of North Fork Chandalar River, sec. 7, T. 36 N., R. 8 W., lat. 67 deg. 57.5 min., long. 149 deg. 26.4 min., Chandalar D-5 quadrangle. Submitted as Devonian "Skajit" Formation.
90AD21AA (10831-CO) , Chandalar , Mottled, tan and gray (weathering and fresh surface), argillaceous (tan areas are most argillaceous), calcitic? dolostone that is locally bioturbated. Collected in "OSm"?? unit, 5 m below fault slice of darker metalimestone and phyllite ("Obpm"?), along ridge on west side of peak 6450 ft., 1.5 miles due east of Nutirwik Creek, and approximately 1 mile south of peak 5310 ft., sec. 9, T. 35 N., R. 9 W., lat. 67 deg. 52.2 min., long. 149 deg. 35.7 min., Chandalar D-6 quadrangle. Submitted as Upper Ordovician-Silurian "OSm"?? of Dillon.
Aphelognathus aff. A. divergens Sweet
32 robust bar, blade, and platform fragments undoubtedly belonging to an Aphelognathus
90AD21B , Chandalar , Black, sooty, finely crystalline, 5-cm-thick metalimestone bed in recessive, 20-meter-thick, calcitic phyllite unit ("Obpm"?). Collected structurally above 90AD21AA, 1 m above base of unit (=fault contact with "OSm"? below). Submitted as Middle Ordovician "Obpm"?.
90AD21E (12071-SD) , Chandalar , Same lithology as 90AD21B, though not as sooty. Collected from top of 20-m-thick, calcitic phyllite unit ("Obpm"?), above 90AD21B, in 20-30-cm-thick beds with calcitic, phyllite partings. Submitted as Middle Ordovician "Obpm"?.
1 Pa element of Polygnathus aff. P. alatus Huddle
1 Pa element of Polygnathus aff. P. planarius Klapper & Lane
30 Pa element fragments of Polygnathus spp. indet.
1 Pb & 1 M (the M resembles elements of Palmatolepis)
17 indet. bar, blade and platform fragments
90AD21I (10832-CO) , Chandalar , Black- and beige-mottled (bioturbated?), limey dolostone, and bioclastic wackestone. Collected above 90ADe21E, 12.5 m above base of 188-meter-thick-measured section of "OSm"? and fault contact with "Obpm"?. Submitted as Upper Ordovician-Silurian "OSm"?.
Aphelognathus sp. indet ....
..... or Plectodina sp. indet.
6 Panderodus sp. elements
17 indet. bar, blade, platform and coniform fragments
90AD21Y (10833-CO) , Chandalar , Orange-and gray-weathering, dark-gray, very fine grained, wackestone/packstone textured, locally dolomitized, colonial corals. Collected above 90AD21I, 90 m above base of 188-meter-thick measured section of "OSm"?; sec. 9, T. 35 N., R. 9 W., lat. 67 deg. 52.2 min., long. 149 deg. 35.3 min., Chandalar D-6 quadrangle. Submitted as Upper Ordovician-Silurian "OSm"?
1 "Belodina" sp. indet. element of late Middle to Late Ordovician morphotype
17 Panderodus sp. elements
90AD22A , Chandalar , Gray- and beige-mottled, pelloidal?, calcitic dolostone locally containing pentamerid brachiopopds. Collected above 90AD21Y, 7 m below top of measured section. Same locality data as 90AD21Y. Submitted as Upper Ordovician-Silurian "OSm"?.
18 Panderodus sp. elements
2 ichthyoliths
90AD23A , Chandalar , Medium-gray-weathering, dolomitic metalimestone forming undulatory, tan- and dark-gray-mottled, 1-3 cm-thick layers. Tan layers are more argillaceous and dolomitic, and contain "amphiporoid" and locally stick stromatoporoid and/or coral? fossil debris. Gray layers locally contain white, sparry calcite (crinoids??). Collected near top? of "Skajit" Fm., which is in fault contact with "purple and green" unit, at approximately 5300 ft. elevation, 0.75 mile south (and slightly west) of peak 6010 ft. on north-trending ridge, 1.25 miles west of Nutirwik Creek, and 4 miles east of Dietrich River; SW1/4 sec. 30, T. 36 N., R. 9 W., lat. 67 deg. 54.6 min., long. 149 deg. 40.9 min., Chandalar D-6 quadrangle. Submitted as Devonian "Skajit" Fm.
90AD26B (10834-CO) , Chandalar , Brown-weathering, black, very fine grained, platey, phyllitic dolostone. Collected from a 30-cm-thick unit overlying black marbles, and underlying black phyllites with minor, marble interlayers; in a small ridgelet at 2850 ft. elevation, approximately 1.25 miles west of Dietrich River, 1.5 miles west of haul road, and 1.5 miles north (and slightly east) of Kaaruk Lake; sec. 3, T. 33 N., R. 10 W., lat. 67 deg. 42.8 min., long. 149 deg. 47.7 min., Chandalar C-6 quadrangle. Submitted as Middle Ordovician "Obpm"?. Similar rocks approximately 2 miles west (and slightly south) of this locality yielded Arenigian conodonts (89PR144).
10 Dapsilodus similaris (Rhodes) elements
16 Panderodus sp. elements
Periodon aculeatus Hadding
1 Spinodus ramosus (Hadding) element
122 indet. bar, blade, platform and coniform fragments (I am certain all fragments are from Periodon an Dapsilodus)
90ALu45A (12072-SD) , Chandalar , Massive, gray-weathering, dark-gray to black, fine-grained metalimestone containing recrystallized white, calcite bioclasts?, and locally containing tubular corals. Metalimestone forms a 30-meter-thick cliff; a single block was collected, but position within the 30 m interval is uncertain. Collected from 4650 ft. elevation, 0.8 mile north of peak 4745 ft., 3.5 miles due east of Matthews River, and 4 miles due west of Quartz Creek; NE1/4 sec. 31, T. 35 N., R. 8 W., lat. 67 deg. 49.2 min., long. 149 deg. 26.2 min., Chandalar D-5 quadrangle. Submitted as Devonian (or Silurian?) "Skajit" Fm. of Brosge, et al.
2 incomplete and deformed Pa elements of Polygnathus sp. indet. of the Polygnathus xylus Stauffer group
2 indet. bar fragments
90ALu60A , Chandalar , Lens of black metalimestone containing locally abundant flattened and deformed stick corals in a gabbro/phyllite unit. Less coralline layers were sampled for conodonts. Collected at 5500 ft. elevation, 1 km southeast of peak 6005 ft., 2.75 miles north of Matthews River, and 7.75 miles east of Dietrich River; SE1/4 sec. 15, T. 35 N., R. 9 W., lat. 67 deg. 51.3 min., long. 149 deg. 32.5 min., Chandalar D-6 quadrangle. Submitted as Middle-Late Devonian (89ATi71 if from this same unit and it yielded Middle-Late Devonian conodonts).
90ANK010A , Chandalar , 5-meter-thick unit of dark-gray, quartzitic, calcitic marble within a metavolcanic succession in schist belt. Collected at approximately 4900 ft. elevation, 2.25 miles due north of Woodland Echo Pass, 1 mile west of headwaters of Schrader Creek, and 1.5 miles northwest of headwaters of Ruby Creek; sec. 31, T. 31 N., R. 6 W., lat. 67 deg. 28.4 min., long. 148 deg. 58.1 min., Chandalar B-4 quadrangle.
90ANK016A , Chandalar , Thin (about 1 m thick) unit of gray, calcitic marble interlayered with calcshists. Collected at about 3400+ ft. elevation, approximately 0.5 mile due east of Limestone Creek, 0.75 mile due west of Mule Creek, and 2 miles north of Bettles River; lat. 67 deg. 20.9 min., long. 149 deg. 22.9 min., Chandalar C-5 quadrangle. Submitted as calcschist package of Horace Mtn. area.
90ANK035A , Chandalar , Thinly-layered unit (approximately 10 m thick) of gray, calcitic marble intercalated with calcschist and calcitic quartz, muscovite schist. Collected from peak 4200 ft., 1.5 miles west of Big Spruce Creek, 1.5 miles east of Matthews River, and 0.75 mile south (and slightly east) of peak 4626 ft.; sec. 20, T. 33 N., R. 8 W., lat. 67 deg. 24.8 min., long. 149 deg. 24.2 min., Chandalar C-5 quadrangle. Submitted as calcschists of Horace Mtn.
90ASV032E , Chandalar , Medium- to light-gray, medium crystalline marble interlayered with calcschists hornfelsed by intrusions of Horace Mtn. Collected at about 4300 ft. elevation, approximately 2 miles west of Big Spruce Creek, 0.5 mile north (and slightly east) of peak 4737 ft., and 1.5 miles east of Matthews River; sec. 32, T. 33 N., R. 8 W., lat. 67 deg. 38.9 min., long. 149 deg. 24.0 min., Chandalar C-5 quadrangle.
90ASV041A , Philip Smith Mts , Rubble crop of orange-weathering, black, platy-foliated, wackestone/packstone-textured limestone locally containing corals. Limestone is a 1-meter-thick unit within a shaley section. Collected from 6010 ft. elevation at top of peak, approximately 1.5 miles north of Kuyukturuk Creek, 4 miles northeast of Oolah Pass, and 5.5 miles west of Dietrich River; sec. 5, T. 16 S.,R. 10 E., lat. 68 deg. 05.0 min., long. 149 deg. 51.6 min., Philip Smith A-5 quadrangle. Submitted as Upper Devonian limey layer in Huntfork.
90ATi1C (12074-SD) , Wiseman , Dark-gray- and dark-brown weathering, dark-gray to black, mm-scale-laminated, marble unit with alternating finely crystalline dolomitic? marble and medium crystalline, black-calcitic marble locally containing subordinate quartz and white mica. Collected from within calcschist unit that includes a deformed conglomerate, along ridge at about 3500+ ft. elevation, 1.15 km southeast of peak 4025 ft., 0.4 km southwest of headwaters of Kelly Gulch, and approximately 2 miles due west of Middle Fork Koyukuk River; SE1/4 SW1/4 sec. 32, T. 29 N., R. 12 W., lat. 67 deg. 17.4 min., long. 150 deg. 16.3 min., Wiseman B-1 quadrangle. Submitted as either Lochovian (based on sample 89TM314), or Silurian-Devonian? (based on sample 88SK104A) from this calcschist unit.
1 Sb element of Silurian-Devonian morphotype
5 indet. bar and blade fragments
90ATi47Z , Chandalar , Medium-dark-gray-weathering, dark gray, relatively pure marble unit occuring within calcschist sequence. Marble unit is approximately 3-meters-thick, forming 1-3 cm-thick layers with mm-thick partings (rich in micas, chlorite, etc.) spaced 1-3 cm apart. Collected at about 4400 ft. elevation, approximately 0.1 mile northeast of peak 4519 ft., 2.5 miles due north and 2.1 miles west of Robert Creek, and 2.5 miles east of Sheep Creek; sec. 15, T. 33 N., R. 7 W., lat. 67 deg. 41.0 min., long. 149 deg. 06.5 min., Chandalar C-5 quadrangle. Submitted as calcschists of Horace Mtn.
90ATi84A , Chandalar , Black marble with local, black "clasts" in gray matrix (suggesting protolith was pebbly). Marble occurs within a thick, calcschist sequence. Collected at about 3000 ft. elevation, 0.25 mile east of Coon Gulch, 1.75 miles south of Middle Fork Koyukuk River, and approximately 1 mile west of Rainbow Gulch; sec. 3, T. 30 N., R. 11 W., lat. 67 deg. 26.9 min., long. 149 deg. 38.5 min., Chandalar B-6 quadrangle. Submitted as Lochkovian (based on sample 89TM314 collected from this unit).
90ATi91A , Chandalar , Black, locally clastic-textured dolostone occuring within a thick calcschist sequence. Collected at about 4400 ft. elevation, 1 mile east of Howard Creek, and approximately 3 miles south of Minnie Creek; sec. 35, T. 30 N., R. 11 W., lat. 67 deg. 23.0 min., long. 149 deg. 35.2 min., Chandalar B-6 quadrangle. Submitted as Lochkovian (based on sample 89TM314 collected from this unit).
90LL65 , Wiseman , Dark-gray, finely crystalline, thin-platey, marble unit (about 4 m thick), that immediately underlies a 200 ft-thick, white marble unit, and overlies a thick sequence of micaceous calcschist locally containing thin interlayers of marble. Collected at about 3500 ft. elevation, 4 miles south of East Creek, 2 miles east of Fall Creek, and 4.5 miles west (and slightly south) of Ipnek Mountain; center sec. 29, T. 29 N., R. 16 W., lat. 67 deg. 18.6 min., long. 151 deg. 09.7 min., Wiseman B-3 quadrangle. Submitted as Early Devonian, based on western equivalent of calcschist unit (=sample 89TM314).
90TM429B , Dark-gray to black, finely crystalline, lenticular-layered metalimestone locally containing white bioclasts?. Metalimestone is questionably within a sequence of metasiltstone, phyllite, marble, and calc-metasandstone (hornfelsed by Horace Mtn. pluton), which is overlain by "Skajit" Fm. Collected from 4400 ft. elevation along east side of 4600 ft. peak, 0.75 mile due north of Mule Creek, and 1.33 mile west of Big Spruce Creek, sec. 8/9 boundary, T. 32 N., R. 8 W., lat. 67 deg. 37.1 min., long. 149 deg. 21.7 min., Chandalar C-5 quadrangle.
90TM435B , Chandalar , Sooty, black metalimestone with locally abundant white, sparry bioclasts? Lithology similar to rock type collected at sample 90AD6A, but is intercalated? with calcschists (or a fault lens?). Collected less than 0.1 mile downstream (south) of 90AD6A along west bank of Big Spruce Creek, about 100 m south of junction with unnamed creek, 1.3 miles west of peak 3240 ft., and approximately 2 miles due north of Bettles River; NW1/4 sec. 10, T. 32 N., R. 8 W., lat. 67 deg. 36.9 min., long. 149 deg. 18.6 min., Chandalar C-5 quadrangle.
90TM445B , Chandalar , Three-meter-thick unit of sooty, dark-gray, fissile, argillaceous metalimestone containing calcite veins and possible crinoid columnals. Metalimestone is associated with fissile, black, calcitic phyllite rubble at base of massive marble ("Skajit" Fm.), which overlies a chlorite-quartz phyllite and semischist unit. Collected at about 4100 ft. elevation, 1 mile due east of Matthews River, and 1.5 miles due west of Big Spruce Creek; sec. 17, T. 33 N., R. 8 W., lat. 67 deg. 41.1 min., long. 149 deg. 24.8 min., Chandalar C-5 quadrangle. Submitted as "Skajit" Formation? or Middle Ordovician "Obpm"?.
90TM448 (10851-CO) , Chandalar , Thin-bedded (locally), mottled, orange-weathering, medium-dark-gray, packstone-textured marble locally containing quartz pebbles, echinoid fragments and other fossil debris. Collected at about 4000 ft. elevation, 0.5 mile north of Matthews River, 0.8 mile south (and slightly west) of peak 5505 ft; sec. 27, T. 35 N., R. 9 W., lat. 67 deg. 49.5 min., long. 149 deg. 32.8 min., Chandalar D-6 quadrangle. Submitted as Devonian? "Skajit" Formation.
13 polyplacognathiform elements of Eoplacognathus lindstroemi (Hamar) transitional to Eoplacognathus elongatus (Bergstrom)
Erraticodon balticus Dzik
Periodon aculeatus Hadding
329 Protopanderodus varicostatus (Sweet & Bergstrom) elements
Pygodus anserinus Lamont & Lindstrom
12 Spinodus ramosus (Hadding) elements
76 indet. bar, blade, platform and coniform elements
90TM452A (12075-SD) , Chandalar , Very sooty, dark-gray to black, phyllitic metalimestone. Collected on west side of stream junction, 2.5 miles east (and slightly north) of peak 4633 ft., and 2.25 miles west (and slightly north) of peak 4201 ft.; sec. 8, T. 36 N., R. 8 W., lat. 67 deg. 57.9 min., long. 149 deg. 23.5 min., Chandalar D-5 quadrangle. Submitted as Ordovician? "Obpm"?, Devonian? "Skajit" Formation?, or "purple and green" unit?
1 incomplete Pa element of Polygnathus sp. indet. of Givetian-Famennian morphotype
3 indet. bar, blade and platform fragments
90TM453B (12076-SD) , Chandalar , One-meter-thick, sheared (locally), orange-weathering, black, echinoid fragment-bearing, metalimestone unit occuring within "purple and green" phyllite unit. Collected at about 4100+ ft. elevation, approximately 0.5 mile south of peak 4165 ft. on north-trending ridge, 1.25 miles west of North Fork Chandalar River, and 0.5 mile north (and slightly west) of peak 4105 ft.; sec. 34, T. 37 N., R. 8 W., lat. 67 deg. 59.2 min., long. 149 deg. 21.7 min., Chandalar D-5 quadrangle. Submitted as Devonian?? "purple and green" phyllite unit.
19 Pa elements of Ancyrodella spp. indet. of post-very earliest Frasnian morphotype
1 Pa element of Ancyrognathus cf. A. coeni Klapper
4 P elements of Icriodus sp. indet.
1 Pa element of Palmatolepis plana Ziegler & Sandberg
3 Pa elements of Palmatolepis proversa Ziegler
19 Pa element fragments of Palmatolepis spp. indet.
19 Pa elements (mostly fragments) of Polygnathus spp.
7 Pb (+3 morphotypes), 2 M & 5 Sc (3 morphotypes)
62 indet. robust bar, blade and platform fragments
90TM462C (12077-SD) , Philip Smith Mts , Five-cm-thick, orange-weathering, medium-gray metalimestone beds with crinoidal fossil-hash interbedded with siltstone, shale and lesser sandstone. Collected at about 5200 ft. elevation, on south side of hill, 0.5 mile southeast of peak 5640 ft., approximately 4.5 miles east of Chandalar shelf, and 6.5 miles due east of Dietrich River; sec. 19, T. 16 S., R. 12 E., lat. 68 deg. 02.3 min., long. 149 deg. 26.4 min., Philip Smith A-5 quadrangle. Submitted as Upper Devonian Huntfork Formation.
7 Pa (most are incomplete) elements of Polygnathus spp. of late Givetian-Frasnian morphotype
27 indet. bar, blade and platform fragments
90TM465A , Chandalar , Massive, sheared, light-gray (weathered and fresh surface), finely crystalline marble containing echinoid fragments and numerous calcite veins; in fault-contact with "purple and green" unit. Collected at about 4700 ft. elevation, 1.6 miles northeast of Table Mountain, and approximately 1 mile due north of peak 5660 ft.; sec. 27, T. 37 N., R. 9 W., lat. 67 deg. 59.8 min., long. 149 deg. 34.0 min., Chandalar D-6 quadrangle. Submitted as Devonian? "Skajit" Formation.
90TM466B , Chandalar , Thin layer of medium-gray-weathering, dark-gray, locally sandy metalimestone within "purple and green" unit, which is associated with felsic rocks. Collected at 5300 ft. elevation, approximately 1.5 miles south (and slightly east) of Table Mountain, and 1.5 miles north (and slightly east) of headwaters of Nutirwik Creek; sec. 4, T. 36 N., R. 9 W., lat. 67 deg. 58.2 min., long. 149 deg. 35.5 min., Chandalar D-6 quadrangle. Submitted as Devonian?? limey layer within "purple and green" unit.
90TM468B , Chandalar , Black, fine grained, limestone lenses within a platey, tan- and gray-weathering, "purple and green" lithic sandstone unit. The "purple and green" unit is structurally above and in fault contact with the "Skajit" Formation. Collected on southeast-trending ridge, at 4000 ft. elevation, approximately 0.75 mile southeast of peak 4205, and 3 miles east (and slightly south) of Table Mountain: SE1/4 sec. 36, T. 37 N., R. 9 W., lat. 67 deg. 58.9 min., long. 149 deg. 30.4 min., Chandalar D-6 quadrangle. Submitted as Devonian?.
90TM468C , Chandalar , Highly sheared, dark-gray to black limestone with thin, white, quartz veins and rarely relict bioclasts?. Collected in "Skajit" Formation, structurally below 90TM468B, on southeast-trending ridge, at 4000 ft. elevation, approximately 0.75 mile southeast of peak 4205 ft., and 3 miles east (and slightly south) of Table Mountain; SE1/4 sec. 36, T. 37 N., R. 9 W., lat. 67 deg. 59.0 min., long. 149 deg. 30.6 min., Chandalar D-6 quadrangle. Submitted as Devonian? "Skajit" Formation.
1 unassigned M? element fragment
90TM476A (12078-SD) , Chandalar , Orange-weathering, very dark-gray, very finely crystalline limestone rarely containing crinoids. Limestone forms a 10-meter-thick unit within a recrystallized lime mudstone near the base of the Huntfork Formation (which locally contains gabbros). Collected at 4200 ft. elevation, approximately 1 mile southeast of peak 5128 ft., and 4 miles north of headwaters of Thru Creek; sec. 31, T. 37 N., R. 4 W., lat. 67 deg. 59.0 min., long. 148 deg. 33.7 min., Chandalar D-4 quadrangle. Submitted as Frasnian (based on fossil reported by Brosge and Reiser).
11 Pa elements of Ancyrodella gigas Youngquist elements
5 P elements of Icriodus sp.
2 Pa elements of Klapperina ovalis (Ziegler & Klapper)
31 Pa elements of Mesotaxis falsiovalis Sandberg, Ziegler & Bultynck
1 Pa element fragment of "Ozarkodina" sp. (long-bladed morphotype)
101 Pa elements of Polygnathus webbi Stauffer plexus
17 Pb (3 morphotypes), 5 M (+3 morphotypes), 2 Sa, 1 Sb &amp; 20 Sc (+3 morphotypes)
300 indet. bar, blade and platform fragments
10 ichthyoliths
90TM482A , Chandalar , Massive, 30-meter-thick rubble crop of gray-weathering, dark-gray limestone containing abundant recrystallized, white calcite material, and locally containing colonial corals. Collected on unnamed tributary of Quartz Creek, approximately 1.25 mile west of, and on south side Quartz Creek, and 4 miles east of Matthews River; sec. 27, T. 35 N., R. 8 W., lat. 67 deg. 49.4 min., long. 20.6 min., Chandalar D-5 quadrangle. Submitted as Devonian? "Skajit" Fm.? or "Huntfork with gabbros"?.
90TM511A , Wiseman , Medium- to dark-gray, relatively carbonaceous, micaceous marble with mica generally concentrated along mm-thick folia, and spaced a few mm to several cm apart. Sample was taken from the darkest and thickest laminated marble encountered. Collected in the Jesse Mountain schist package, which contains black quartzites and phyllites, along with micaceous calcschists and marbles (Barren samples 89AD22B and 22E were from this unit also), at 3600 ft. elevation, approximately 1 mile due north of King Creek, 1.25 mile due south of Hammond River, and 1 mile southeast of peak 3572 ft.; sec. 22, T. 33 N., R. 11 W., lat. 67 deg. 40.5 min., long. 150 deg. 05 min., Wiseman C-1 quadrangle.
90TM514B (12079-SD) , Chandalar , Folded, orange-weathering, dark-gray, finely crystalline, metalimestone bed (approximately 2 m thick) within sequence of gray phyllite. Collected at about 5400 ft. elevation, approximately 1/8 mile south of peak 5434 ft., 5 miles east of haul road, and 2.5 miles east of Snowden Creek; sec. 27, T. 34 N., R. 9 W., lat. 67 deg. 44.7 min., long. 149 deg. 34.0 min., Chandalar C-6 quadrangle. Submitted as Upper Devonian? Huntfork? Formation.
25 Pa (mostly deformed fragments) elements of Polygnathus spp. indet.
1 Pa element (incomplete) of Polygnathus sp. indet. of Late Devonian morphotype
5 Pb, 2 M & 2 Sc
73 indet. bar, blade, and platform fragments
90TM517A , Philip Smith Mts , Red-weathering, black, burrowed? (possible mud chips), sandy and locally dolomitic layers (10-20 cm thick) within a sequence of interbedded sandstone and shale (ratio = 1:1). Collected at about 6000 ft. elevation, on north-trending ridge, approximately 0.5 mile south of peak 6822 ft., 1 mile west of Itikmalak River, and 6.75 miles east of Itkillik River; sec. 36, T. 13 S., R. 10 E., lat. 68 deg. 16.3 min., 149 deg. 43.2 min., Philip Smith B-5 quadrangle. Submitted as Upper Devonian? Huntfork? Formation, but mapped as Noatak Sandstone by Brosge and others.
1 Pa element of Polygnathus sp. indet. of Middle-Late Devonian morphotype
1 unassigned M element
90TM519A (30938-PC) , Philip Smith Mts , Thin-bedded (5-10 cm-thick), rippled, possibly redeposited (turbidite?), fossiliferous limestone with abundant horn corals and crinoids; interbedded with rhythmic-bedded, black shale. Collected from the basal meter of a 5-m-thick unit, along the top of a ridge, at 6200+ ft. elevation, 5 miles due west of Atigun Pass, approximately 5/8 mile east (and slightly north) of headwaters of Dietrich River, on the Continental Divide; sec. 19, T. 15 S., R. 11 E., lat. 68 deg. 07.5 min., long. 149 deg. 40.2 min., Philip Smith A-5 quadrangle. Submitted as Lower Mississippian? Kayak Shale.
3 Pa elements of Bispathodus? n. sp.
2 Pa elements of Bispathodus sp. indet. (not B. stabilis)
16 Pa elements of Mehlina sp.
46 Pa elements of Polygnathus longiposticus Branson & Mehl
37 Pa elements of Siphonodella isosticha (Cooper)-S. obsoleta Hass
9 Pb (3 morphotypes), 36 M (+5 morphotypes), 5 Sa & 40 Sc (+5 morphotypes)
352 indet. bar, blade, and platform fragments
120 ichthyoliths
90TM527A (12081-SD) , Philip Smith Mts , Fifty-cm-thick bed of orange-weathering, dark-gray, possibly redeposited limestone containing fossiliferous debris and argillite chips. Limestone is intercalated with slates and sandstones (turbidites). Sandstone/slate ratio = 1:100. Collected at 5600+ ft. elevation, 0.25 south (and slightly west) of peak 5830 ft., and 1.5 miles west of North Fork Chandalar River; center sec. 10/15 boundary, T. 16 S., R. 12 E., lat. 68 deg. 03.9 min., long. 149 deg. 19.5 min., Philip Smith A-4 quadrangle. Submitted as Upper Devonian Huntfork Formation, and possibly derived from rocks of sample 90TM529A.
3 Pa element fragments of Polygnathus aff. P. gracilis Klapper & Lane
53 Pa elements of Polygnathus pacificus Savage & Funai
5 Pa elements of Polygnathus planarius Klapper & Lane
16 Pa elements of Polygnathus aff. P. samueli Klapper & Lane (most are incomplete)
100 Pa elements fragments of Polygnathus spp. indet. fragments
14 Pb (3 morphotyes), 2 M, 4 Sa, 7 Sa, 7 Sb (2 morphotypes) & 25 Sc (+3 morphotypes)
+175 indet. bar, blade and platform fragments
90TM529A (12082-SD) , Philip Smith Mts , Five-meter-thick, isoclinally folded, dark-gray to black, "petroliferous-smelling" limestone lens loaded with crinoid columnals (some articulated). Collected at about 4600 ft. elevation, on northwest spur, approximately 1 mile north (and slightly west) of peak 6083 ft., and 1.25 miles east of North Fork Chandalar River; sec. 7, T. 16 S., R. 13 E., lat. 68 deg. 04.1 min., long. 149 deg. 12.3 min., Philip Smith A-4 quadrangle. Submitted as Upper Devonian Huntfork? or Beaucoup?? Formation.
2 Pa elements of Ancyrodella nodosa Ulrich & Bassler .....
..... or A. gigas Youngquist
1 Pa element fragment of Ancyrodella sp. indet.
2 juvenile Pa elements of Polygnathus aff. P. pacificus Savage & Funai
1 Pa element fragment of Polygnathus sp. indet.
10 indet. bar, blade and platform fragments
90TM570A (12083-SD) , Philip Smith Mts , Thirty cm-thick, graded (argillite at top), orange-weathering, dark-gray, fossil-debris bed containing brachiopods and crinoids; intercalated with shale and rarely sandstone (ss/sh ratio = 1/1000). Collected at about 5700+ ft. elevation, approximately 0.75 mile south (and slightly east) of peak 5668 ft., and 1 mile north (and slightly west) of peak 5842 ft.; NW1/4 sec. 29, T. 14 S., R. 14 E., lat. 68 deg. 12.5 min., long. 148 deg. 57.5 min., Philip Smith A-4 quadrangle. Submitted as Upper Devonian Huntfork Formation.
18 Pa elements of Polygnathus pacificus Savage & Funai
2 Pa element fragments of Polygnathus aff. P. samueli Klapper & Lane
73 Pa element fragments of Polygnathus spp. indet.
Polygnathus spp. indet.
49 indet.bar, blade and platform fragments
1 phosphatized ostracode steinkern
90TM574A (12084-SD) , Philip Smith Mts , Somewhat sheared, light-gray to slightly orangish-weathering, dark-gray, crinoid-rich limestone also containing corals (some colonial). Sample taken approximately 5 m below top of a 100-meter-thick, carbonate sequence that is in thrust contact?? (Toyuk thrust??) with, and overlain by Huntfork shale sequence. Collected at about 4100 ft. elevation, approximately 0.75 mile north (and slightly west) of peak 5668 ft., and 1.75 miles due west of peak 6272 ft.; sec. 18, T. 14 S., R. 14 E., lat. 68 deg. 13.7 min., long. 148 deg. 58.5 min., Philip Smith A-4 quadrangle. Submitted as either Devonian? or Lisburne?.
1 adenticulate belodellid element
1 P element of Icriodus sp.
Palmatolepis plana Ziegler & Sandberg (=Pa. aff. Pa. domanicensis Ovnatanova of Klapper and Lane, 1989)
Pa elements of Polygnathus aff. P. pacificus Savage and Funai
2 unassigned Sc elements of 2 morphotypes
8 indet. bar, blade and platform fragments