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Report on Referred Fossils
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Stratigraphic range: Lower Lower Jurassic
Kinds of fossils: Mollusks
Quadrangle or area: Karluk (D-4) & Karluk (C4 and C5) quads.
Shipment No.: A-81-11
Referred by: Detterman, Robert L.
Report prepared by: Imlay, Ralph W.
Date: 02/12/1981

AGES OF SOME LOWER JURASSIC AMMONITES FROM THE PUALE BAY-ALINCHAK BAY AREA

Waehneroceras cf. W. portlocki (Wright) at loc. 80ADt166 has been found previously on the south side of Alinchak Bay at Mesozoic localities 12075, 12394, 25694, 29268 and ROC loc. 3002. It has been found previously on the east side of Puale Bay at Mesozoic localities 3110, 29267, and 31370. The genus is of middle Hettangian age (see Imlay and Detterman, 1977, Amer. Assoc. Petroleum Geologists Bull. 61, figs. 1, 2 and p. 611).

Arnioceras cf. A. densicostata (Quenstedt) at loc. 80AJm3 has been found previously on the east side of Puale Bay near the top of the Lower Jurassic beds at Mesozoic locs. 21237, ROC 1282 and ROC 1283. The genus is of late early Sinemurian age.


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Brief statement of problem and remarks (from collector):
Identifications needed for the fossils from Alinchak Bay to compare with the Puale Bay section. These are the only occurrences of Lower Jurassic on the Alaska Peninsula. Also, needed for correlation with area near Anchorage.
User Note module to be added
80ADt166 , Karluk , Karluk D-4 Quad., Sec. 14, T. 28 S., R. 37 W., lat. 57 deg. 45 min. 50 sec. N., long. 155 deg. 18 min. 50 sec. W., 2.85 mi. S. 20 sec. (the submitter obviously meant 20 deg., note by R.B. Blodgett) W. of the end of the spit in Alinchak Bay, limestone.
Waehneroceras cf. W. portlocki Wright
Waehneroceras cf. W. tenerum Neumayr
Discamphiceras sp.
80ACe228 , Karluk , Karluk D-4 Quad., Sec. 22, T. 28 S., R. 37 W., lat. 57 deg. 45 min. 12 sec. N., long. 155 deg. 19 min. 58 sec. W., 3.8 miles S. 22 deg. W. of the end of the spit in Alinchak Bay, sandstone.
Colonial corals
Brachiopods
Camptonectes?
80AJm2 , Karluk , Karluk Quad. Base of cliff on coast south of stream about 2,500 ft. south, 13 deg. east of VABM Bay.
Brachiopod
Bivalves
80AJm2a , Karluk , same loc. as 2 above.
Bivalves
80AJm3 , Karluk , Karluk Quad. Silty beds above limestone contact with tuffaceous sandstone on southeast side of fault in tidal zone reef; 2,900 ft. south of VABM Bay.
Camptonectes (Camptochlamys?)
Arnioceras cf. A. densicosta (Quenstedt)