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Authors: Dusel-Bacon, Cynthia , Harris, Anita G.
Editors:
Date: /2003
Title: New occurrences of Late Paleozoic and Triassic fossils from the Seventymile and Yukon-Tanana terranes, east-central Alaska, with comments on previously published occurrences in the same area
1678 , , 5-30 ,
Host: U.S. Geological Survey Professional Paper:
Document Type: Article\Abst.\Chapter\report
Annotation: Abstract - The discovery of several new fossil occurrences of late Paleozoic conodonts and radiolarians in the Seventymile and Yukon-Tanana terranes, and of Late Triassic conodonts in the Seventymile terrane in east-central Alaska, has prompted a reevaluation of other late Paleozoic and Triassic fossils reported in the same areas. The report, in 1995, of giant parafusulinids in the Seventymile terrane within the same stratigraphic interval that more than 20 years before produced poorly preserved Permian brachiopods helped place these beds in the middle Guadalupian and to position the terrane at tropical to subtropical latitudes near ancestral North America during the Middle Permian. .....
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No Data (Mesozoic loc. 35008) , Eagle , Eagle C-1 quadrangle, lat 64 deg. 31'09" N., long 141 deg. 25'42" W. Seventymile terrane. Unit Pq of Foster (1976); quartzite and argillite that includes unmetamorphosed to slightly metamorophosed phyllite, metaconglomerate, chert, limestone and (or) marble, and graywacke to metagraywacke. Core consists of gray and black carbonaceous, quartzose limestone that is locally recrystallized and has poorly developed styolites, as well as minor white calcite veins, rare quartz veins as much 1.3 cm in diameter, and scattered pryite. From WGM, Inc.'s drilling of Doyon Ltd.'s Lead Creek property, diamond-drill hole LC-7; core split vertically from 731.6 to 741.1 ft below the surface. Collected by WGM, Inc., geologists and submitted to C. Dusel-Bacon; identified by A.G. Harris. (description from Dusel-Bacon and Harris, p. 12 (table 1)).
75 chiefly juvenile, subadult and a few adult Pa elements of Epigondolella quadrata Orchard
73 epigondolellid and (or) .......
...... metapolygnathid Pa element fragments
1 xaniognathiform Pb element
1 Pa element of Metapolygnathus nodosus (Hayashi)
2 Pa elements of Metapolygnathus primitius (Mosher)
1 Pa element of Metapolygnathus samueli Orchard
No Data , Eagle , Eagle B-1 quadrangle, lat 64 deg. 28'40" N., long 141 deg. 14'35" W. Outcrop at mile 130.5 along the Taylor Highway. Collected by Arco Oil an Gas Co. geologists and identified by T.R. Carr (written commun., 1985. [description from Dusel-Bacon and Harris, 2003, p. 12 (Table 1)]
Metapolygnathus primitius (Mosher)
No Data , Eagle , Eagle C-1 quadrangle, lat 64 deg. 40'30" N., long 141 deg. 02'30" W. Collected by Arco Oil and Gas Co. geologists and identified by T.R. Carr (written commun., 1985) (description from Dusel-Bacon and Harris, 2003, p. 12 (Table 1))
poorly preserved conodonts of late Paleozoic age
No Data , Eagle , Eagle A-2 quadrangle, lat 64 deg. 07'00" N., long 141 deg. 46'15" W. Collected by Arco Oil and Gas Co. geologists and identified by T.R. Carr (oral commun., USGS, 1985) (decription from Dusel-Bacon and Harris, 2003, p. 12)
poorly preserved conodonts of late Paleozoic age
96ADb60b (33342-PC) , Eagle , Eagle B-2 quadrangle, lat 64 deg. 24'52" N., long 141 deg. 46'59" W. Outcrop of alternating quartzose and metcarbonate layers through 1 m of section. Sample is from a large marble body within amphibolite-facies unit characterized by biotite gneiss and amphibolite. Collected by C. Dusel-Bacon and identified by A.G. Harris (description from Dusel-Bacon and Harris, 2003, p. 12)
8 incomplete recrystallized Pa elements of Cavusgnathus sp. ......
........ or Adetognathus sp.
82AFr103 , Eagle , One creek east of Granite Creek in the southeast quadrant of Section 1, T. 1N., R. 27E., Eagle (D-3) quadrangle, east-central Alaska. About 360 m of hill 2680 at approximately 64 deg. 54'20" N., 142 deg. 09' W. (description from Stevens, 1995, p. 808)
Parafusulina? sp. A of Stevens, 1995
72AFr445 (24951-PC) , Eagle , Eagle (D-3) quadrangle 1:63,360; near junction of center line between NE1/4 and SE1/4 and eastern boundary of sec. 8, T1N, R28E; elev. approx. 2550 ft., on spur west of Suter Creek Creek, a tributary of the Seventymile River; quartzitic rocks apparently in fault slice between amphibolite facies metamorphic rocks on the north and an igneous dike on the south. (description from Dutro E&R report) [Dusel-Bacon and Harris, 2003, p. 13 provide following description: Eagle D-3 quadrangle, lat 64 deg. 55'45" N., long. 145 deg. 04'33"W. Collected by H.L. Foster in 1972 and identified by J.T. Dutro, Jr.]
Anemonaria sp.
Megousia sp.
Neospirifer sp.
Spiriferella sp.
Tityrophora? sp.
Yakovlevia sp.
Punctate spiriferoid, indeterminate
73AFr112 (23598-PC) , Eagle , Alaska, Yukon-Tanana Upland, Eagle D-3 Quad.; T. 1 N., R. 28 E.; 64 deg. 55 min. 43 sec. N. Lat.; 143 deg. 04 min. 42 sec. W. Long.; zone of rubble and broken gray fine-grained quartzite, about 200 ft. wide, on narrow wooded ridge. Collector: H. L. Foster, 1973. (description from Dutro E&R report) [Dusel-Bacon and Harris, 2003, provide following description: Eagle D-3 quadrangle, lat 64 deg. 55'45"., long. 142 deg. 04'31" W. Collected by H.L. Foster in 1973 and identified by J.T. Dutro, Jr.]
Anemonaria? sp.
Megousia sp.
Neospirifer sp.
Spiriferella sp.
Thamnosia? sp.
Waagenoconcha? sp.
Orthotetid indeterminate
Pectinid pelecypod fragment
73AFr122B (23599-PC) , Eagle , Alaska, Yukon-Tanana Upland, Eagle D-3 Quad.; T. 1 N., R. 28 E.; 64 deg. 55 min. 46 sec. N. Lat.; 142 deg. 05 min. 46 sec. W. Long.; gray quartzite about 1 mile west of brachiopod locality 73AFr112, apparently same bed. Collector: H. L. Foster, 1973. (description from Dutro E&R report)[Dusel-Bacon and Harris, 2003, p. 13 provide following description: Eagle D-3 quadrangle, lat. 64 deg. 55'46" N., long 142 deg. 06'40" W. Collected by H.L. Foster in 1973 and identified by J.T. Dutro, Jr.]
Chonetinella? sp.
Neospirifer? sp.
Spiriferella sp.
Yakovlevia sp.
Productoid, indeterminate
Punctate spiriferoid, indeterminate
75AFr3295 , Big Delta , Big Delta D-1 quadrangle, lat. 64 deg. 54'28" N., long 144 deg. 15'10" W. Seventymile terrane. From red chert associated with green and gray chert. Chert is interlayered with basaltic greenstone that, in turn, is associated with serpentized ultramafic rocks (Foster and others, 1978). Sedimentary rocks are associated with the peridotite of Salcha River (Foster and others, 1994). Collected by T.E.C. Keith in 1975, conodonts identified by B.R. Wardlaw (Foster and others, 1978) and radiolarians identified by D.L. Jones, USGS (Foster and others, 1978). (description from Dusel-Bacon and Harris, 2003, p. 13)
juvenile Pa elements Mesogondolella sp. of Sakmarian-Guadalupian morphotype
Streptognathodus sp.
xaniognathiform element
Paronaella sp. forms with complete outer margins connecting the three primary arms
uunamed morphotypes related to late stages of the family Albaillellidea
unnamed elongate ladderlike specimens with large reticulate pore
77AFr3189 (33657-PC; MR0349) , Big Delta , Big Delta D-1 quadrangle, lat 64 deg. 54'29" N., long 144 deg. 15'08" W. Seventymile terrane. From red chert associated with green and gray chert. Chert is interlayered with basaltic greenstone that, in turn, is associated with serpentized ultramafic rocks (Foster and others, 1978). Sedimentary rocks are associated with the peridodite of Salcha River (Foster and others, 1994). Collect by T.E.C. Keith in 1977. Conodonts identified by B.R. Wardlaw; radioarlians by B.L. Murchey (written commun., 2002) (description from Dusel-Bacon and Harris, 2003, p. 14)
1 juvenile Pa element Mesogondolella sp.
Paronaella? cf. P.? sp. A of Murchey, 1990
Pseudoalbaillella u-forma Holdsworth and Jones, 1980 [type specimens--this sample], morphotype 1 of Ishiga
Pseudoalbaillella levitoflexa (Nazarov) Isakova and Nazarov, 1986
Pseudoalbaillella sp. aff. P. levitoflexa (shorter abdomen)
Pseudoalbaillella sp. aff. P. bulbosa Ishiga
Pseudoalbaillella sp. aff. P. scalprata Holdsworth and Jones, 1980
Triactofenestrella sp., morphotype group 2 of Murchey
96ADb58a , Charley River , Charley River A-4 quadrangle, lat 65 deg. 02'21" N., long 142 deg. 33'20" W. Seventymile terrane(?). Greenstone unit gs of Brabb and Churkin (1969); Foster and Keith (1987) remapped the area near this sample and placed it in a greenstone unit that they include in the Seventymile terrane. Sample from metalimestone and metasandstone in 15-m-high cliff. Collected by C. Dusel-Bacon and identified by A.G. Harris. (description from Dusel-Bacon and Harris, 2003, p. 14)
4 robust bar fragments
4 possible conodont bar fragments
85AFr83-103 (MR 3553) , Charley River , Charley River A-5 quadrangle, lat 65 deg. 02'04" N., long 143 deg. 10'45" W. Seventymile terrane. Northwest part of peridotite of Mount Sorenson of Foster and others (1994); red-and-gray chert overlain by massive greenstone (gabbro and serpentine crop out to south)(Foster and others, 1994). Collected by H.L. Foster and identified by B.L. Murchey; re-examined by Murchey in 2002 (written commun., 2002) (description from Dusel-Bacon and Harris, 2003, p. 14)
Albaillella sp. cf. A. undulata Deflandre
Albaillella sp. cf. A. uncus Won
Albaillella spp.
1 pylentonemiid, possibly Pylentonema sp.
poorly preserved spheroidal spumellarians
poorly preserved sponge spicules