Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Jurassic
Kinds of fossils: Mollusks
Quadrangle or area: Mt. Michelson, Alaska
Shipment No.: A-69-11
Referred by: Detterman, Robert L.
Report prepared by: Imlay, Ralph W.
Date: 10/08/1969

The fossils from the Kingak Formation exposed in the northeastern part of the Brooks Range are of Early Jurassic to early Oxfordian ages.

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69ADt105f , Mt Michelson , Fire Creek, 6.2 miles N. 85 deg W of juction with Sadlerochit River. From 18 feet of massive olive gray silty sandstone at base of Kingak Formation.
Gryphaea cf. G. cymbium Lamarck
Oxytoma cf. O. inequivalvis (Sowerby)
69ADt106B , Mt Michelson , Fire Creek, 6.3 miles N. 85 deg W of junction with Sadlerochit River. Concretions in silty clay shale, about 200 feet above base.
Camptonectes sp.
Worm tubes
69ADt78B , Mt Michelson , Ridge west of Karen Creek, 2.4 miles S. 55 deg E of Schrader lake outlet. Concretion in black, fissile, silty clay shale, about 250-300 feet above base of formation.
undetermined pelecypod fragment
69ADt144 , Mt Michelson , Marsh Creek, 4 miles north of Mt. Weller. Siltstone about 500 feet above base.
Pseudolioceras sp.
Inoceramus sp.
Belemnite fragment
69ADt85A , Mt Michelson , Karen Creek, 4 miles east of outlet of Schrader Lake. Concretionary fissile black clay shale about 1000 feet above base.
Inoceramus? sp.
69ADt42C , Mt Michelson , Ignek Valley, 6.3 miles S. 75 deg E of Katakturuk Canyon. Black shale with siltstone interbeds and many concretions about 850 feet below basal sandstone of Ignek Formation.
Inoceramus lucifer Eichwald
Ammonite fragments
69ADt42 , Mt Michelson , Ignek Valley, 6.4 miles S. 75 deg E of Katakturuk Canyon. Olive gray siltstone and silty shale about 600 feet below basal Ignek Sandstone.
Inoceramus cf. I. ambiguus Eichwald
Belemnite fragment
69ADt41A , Mt Michelson , Ignek Valley, 6.5 miles S. 75 deg E of Katakturuk Canyon. Concretions in black clay shale about 275 feet below basal Ignek Sandstone.
Arcticoceras kochi Spath
69ADt40 (Mesozoic loc. 29856) , Mt Michelson , Ignek Mesa - Ignek Valley, 6.8 miles S. 75 deg E of Katakturuk Canyon. Concretions in black silty clay shale about 80 feet below basal Ignek Sandstone.(desc. from E&R report; USGS Mesozoic loc. 29856. Ignek Mesa in Ignek Valley, 6.8 miles S. 75° E. of Katakturuk Canyon, lat 69°33'30" N., long 145°20' W., northeast Alaska. Cardioceras (Scarburgiceras). (description from Imlay and Detterman, 1973, p. 25); R. L. Detterman. 1969. Ignek Mesa in Ignek Valley. 11 km S. 75° E. of Katakturuk Canyon, lat 69°33'30" N., long 145°20' W., east-central part of sec. 6, T. 2 N.. R. 28 E., Mt. Michelson Quadrangle. Fossils from concentrations in black silty clay shale of Kingak Shale about 24 m below top. Earlv Oxfordian. (description from Imlay, 1981, USGS PP 1190, p. 23); [USGS Mes. Cat.: 29856 (69 ADt40) Kingak Fm. Oxfordian.Ignek Mesa - Ignek Valley, 6.8 miles S 75° E of Katakturuk Canyon. Lat. 69°33'30" N., Long. 145°20' W., concretions in black silty clay sh about 80 ft. below basal Ignek SS, Mt. Michelson quad., NE Alaska. Coll. by R.L. Detterman, 1969]
Cardioceras (Scarburgiceras) sp.
Inoceramus sp.
69ADt30 , Mt Michelson , Ignek Valley, 4 miles S. 75° E of Katakturuk Canyon. Concretions in black clay shale 20-30 feet below sandstone with Nanushuk fossils (basal Ignek Ss.)
Cadoceras? sp.
Belemnite fragment
Pleuromya sp.