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Report on Referred Fossils
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Stratigraphic range: Mississippian-Permian
Kinds of fossils: Invertebrates
Quadrangle or area: , Kongakut River area
Shipment No.: A-53-19
Referred by: Mangus, M. D.
Report prepared by: Dutro, J. Thomas, Jr.
Date: 05/23/1956

This shipment includes six collections, of which five are Mississippian in age and the sixth is of probable Permian age. Collection 53AMG11 (15428) appears to be of Kayak age (early Mississippian), as that terms has been understood in the northern Alaskan work. Four collections, from near the base of the Alaph limestone, are of late Mississippian age. Collection 53AMg3 (15425), from rocks thought to be equivalent to the Sadlerochit formation, is probably of Permian age.

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53AMg11 (15428-PC) , Demarcation Point , Three and one-half miles east of the Kongakut River on northwest-flowing tributary; approx. 69 deg. 08' N., and 141 deg. 50' W., Collector: Mangus. (description from Dutro E&R report of May 23, 1956; Shipment A-53-19)
Chonetes sp.
Linoproductus? sp.
productid brachiopod, indet.
Spirifer aff. S. missouriensis Swallow
Spirifer aff. S. gregeri Weller
Spirifer aff. S. forbesi Norwood and Pratten
Spirifer sp.
fish teeth, indet.
53AMg1 (15422-PC) , Demarcation Point , East side of Kongakut River; approx. 69 deg. 00' N. lat., 142 deg. 10' W. long.; from lower part of Alapah limestone. Collector: Mangus. (description from Dutro E&R report of May 23, 1956; Shipment A-53-19)
Spirifer aff. S. brazerianus Girty
Spirifer sp.
53AMg2 (15424-PC) , Demarcation Point , Same locality as 15422. (description from Dutro E&R report of May 23, 1956; Shipment A-53-19)
lithostrotionid corals
caninioid corals
53AMg4 (15426-PC) , Table Mtn , East side of Kongakut River; approx. 68 deg. 59'30" N. lat., 142 deg. 09' W. longl; from the lower part of the Alapah limetone. Collector: Mangus. (description from Dutro E&R report of May 23, 1956; Shipment A-53-19)
single specimen of a dictyoclostid brachiopod, perhaps "Dictyoclostus" aff. "D." fliegeli Paeckelmann
53AMg5 (15427-PC) , Table Mtn , Same locality as 15426. (description from Dutro E&R report of May 23, 1956; Shipment A-53-19)
horn corals, undet.
"Dictyoclostus" sp.
Spirifer aff. S. haydenianus Girty
Spirifer aff. S. arkansanus Girty
Spirifer spp.
Neospirifer? sp.
Cleiothyridina sp.
Martinia? sp.
53AMg3 (15425-PC) , Demarcation Point , Sadlerochit Formation, lower limestone; east side of Kongakut River; lat. 69 deg. 01' N., long. 142 deg. 04' W. Collector: M.D. Mangus, 1953. (description from Rowett, 1975, USGS Prof. Paper 823-D, p. 66)[Dutro E&R report of May 23, 1956 (Shipment A-53-19) provides following description: "East side of Kongakut River; approx. 69 deg. 01' N. lat., 142 deg. 04' W. long.; from supposed equivalent of Sadlerochit formation. Collector: Mangus."]
horn corals, undet.
Muirwoodia? sp.
Horridonia? sp.
Choristites sp.
Brachiopod, genus undet.