Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Mississippian & Permian
Kinds of fossils: Marine invertebrates
Quadrangle or area: Arctic, Table Mtn. and Philip Smith quads., Northern Alaska
Shipment No.: A-60-27
Referred by: Brosge, William P.
Report prepared by: Dutro, J. Thomas, Jr.
Date: 01/25/1962

(in consultation with H. M. Duncan) This report covers 13 collections. Ten, comprising more than 250 specimens, [are] from post-Devonian rocks of the southern Brooks Range. Three other collections are pre-Mississippian.

The single collection from the Siksikpuk formation contains the typical Early(?) Permian assemblage found at many localities in the lower part of the unit. The Straparollus is definitive, in this instance.

Four collections from the Lisburne group appear to represent the Wachsmuth limestone. Collection Rr754 is probably upper Wachsmuth while Rr611 and Be733 are most likely lower Wachsmuth. Nothing really definitive can be said about Rr659.

Three collections submitted as possible Mississippian are more likely of Devonian age. They are Rr660, Be722 and Be724. A supplemental report by W. A. Oliver will follow.

Four collections represent the Kayak shale. Of these, Rr613 and Rr611A contain typical assemblages of early Mississippian fossils found elsewhere in this formation in the central Brooks Range.

The final collection, Be682, contains a mixture of Kayak and Wachsmuth rock types as indicated in the transmittal forms.

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60ABe728 , Arctic , A. Shale and slate, dark gray, micaceous ...200+ ft. B. Shale, micaceous, pyritic...10 ft. C. Limestone, dark gray, brown-weathering, very fine grained...2 ft. D. Shale, black, micaceous, silty...5 ft. E. Limestone, dark gray-brown, shaly, silty; few beds of massive cherty ls....50 ft. F. Limestone, dary-gray, fine- to medium-grained, saccharoidal, medium bedded; 2% black chert nodules...25 ft. G. Limestone s in unit E....20 ft. H. Limestone as in Unit F....10 ft. Fossils are mixed collection from units B & C. (11.10 x 9.18 Arctic).
echinoderm debris, indet.
Chonetina? sp.
productoid fragments, indet.
Spiriferella sp.
martinioid brachiopod, undet.
pelecypod fragments, indet.
Straparollus (Euomphalus) alaskensis Yochelson and Dutro
60ARr659 , Arctic , Black, fine-grained shaly to medium-bedded limestone. (17.55 x 2.93 Arctic).
echinoderm debris, indet.
horn coral, indet.
Syringoporoid coral, indet.
rhynchonelloid brachiopod, indet. (perhaps Tetracamera)
spiriferoid brachiopod, indet.
gastropod fragments, indet.
Phillipsia? sp.
60ARr660 , Arctic , Same as RR659. Weathers purplish. Both doubtful Lisburne. May be fault block of Devonian ls in Kanayut. (17.68 x 3.02 Arctic).
60ARr754 , Arctic , Limestone, dark gray, fine to coarse bioclastic with black chert. Fault block in Kanayut. (18.68 x 8.02 Arctic).
small rugose coral, indet.
caninoid? coral, indet.
"Productus" cf. "P." viminalis White
dictyoclostid brachiopod, indet.
Brachythyris cf. B. suborbicularis (Hall)
Torynifer sp.
Dimegelasma? sp.
Straparollus sp.
60ARr611 , Arctic , Limestone light gray, coarse-grained, with black chert. (13.92 x 5.48 Arctic).
echinoderm debris, indet.
Homalophyllites sp.
Zaphrentites sp.
horn corals, indet.
fenestrate bryozoans, indet.
Rhipidomella sp.
Schuchertella? sp.
"Productus" cf. "P." burlingtonensis Hall
Echinoconchus? sp.
Spirifer cf. S. rowleyi (Weller)
Spirifer spp.
Brachythyris aff. B. suborbicularis (Hall)
Straparollus (Euomphalus) brooksensis Yochelson and Dutro
60ABe722 , Arctic , Limestone, black, fine-grained. Black chert. Oil company geologists think is Devonian. (10.45 x 8.00 Arctic).
horn coral, indet.
60ABe724 , Arctic , Limestone, gray, fine-grained, silicified. Black chert. (coordinates: 11.07 x 8.33 Arctic).
colonial coral, poorly preserved.
60ABe733 , Arctic , Limestone, light gray, coarse crinoidal. Black chert. Basal Wachsmuth? (16.10 x 11.08 Arctic).
echinoderm debris, indet.
Fenestella sp.
productellid brachiopod, indet.
"Productus" cf. "P." burlingtonensis Hall
60ABe682 , Philip Smith Mts , Limestone, pale-brown, fine- to medium crystalline and dolomite, medium gray, medium-crystalline; 20% black chert. Rests on black Kayak shale with beds of red-weathering limestone. Fossils are mixed from Kayak and lower Lisburne. (18.65 x 4.82 P. Smith).
large fragments of echinoderm columnals, indet.
echinoderm debris, indet.
fenestrate bryozoans, indet.
Spirifer sp. indet.
60ARr611A , Arctic , Red-weathering limestone in black slate. (13.94 x 5.40 Arctic).
echinoderm debris, indet.
Platycrinus sp.
fenestrate bryozoans, indet.
Rhipidomella sp.
Schizophoria sp.
Schuchertella sp.
Leptaena cf. L. analoga (Phillips)
"Buxtonia? sp.
Spirifer cf. S. platynotus Weller
Spirifer cf. S. gregeri Weller
Spirifer sp.
Brachythyris sp.
Sinuitina? sp.
fish teeth, indet.
60ABe729 , Arctic , Red-weathering limestone in black shale. (11.38 x 10.55 Arctic).
echinoderm debris, indet.
Homalophyllites sp.
60ARr766 , Table Mtn , Red-weathering limestone in black slate. (3.19 x 15.38 Table Mtn.)
echinoderm debris, indet.
spiriferoid brachiopod, indet.
bivalve fragments, indet.
60ARr613 , Arctic , Pink-weathering limestone in muddy slate. Could be Kayak, Devonian graywacke or Devonian limestone siltstone. (13.85 x 5.23 Arctic).
echinoderm debris, indet.
Platycrinus sp.
caninoid? coral, indet.
Syringopora sp.
fenestrate bryozoans, indet.
Rhipidomella sp.
Spirifer cf. S. gregeri Weller
Spirifer sp. (small)
athyrid brachiopod, indet.
Platyceras sp.
Phillipsia? sp.