Sample Detail of
Sample: Sample No. 53AMg3 -- USGS No. 15425-PC
Locality: Field No. 53AMg3
Description: Sadlerochit Formation, lower limestone; east side of Kongakut River; lat. 69o 01' N., long. 142o 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. 69o 01' N. lat., 142o 04' W. long.; from supposed equivalent of Sadlerochit formation. Collector: Mangus."]
Location: Alaska Quadrangle: Demarcation Point A-2
Lat.: 69o01' " Long.: 142o04' "
Reference
Title: Stratigraphic distribution of Permian corals in Alaska ,  1975
Information tabulated by major regions of Alaska is the result of a restudy of all available Permian rugose and tabulate corals from Alaska, completed in 1972. Most specimens were collected by members of the U.S. Geological Survey, beginning with corals collected by F.C. Schrader in 1902, but this list also includes collections of Permian corals made by the writer between 1963 and 1968. Almost half of the specimens studied required revised identifications at the generic level, primarily due to recent changes in taxonomy and classification. No attempt was made to identify specimens at the species level except for a comparatively few specimens which obviously were conspecific with described species and for species described by Rowett (1969). Stratigraphic and locality information provided by the original collectors also has been updated where possible by reference to more recent geologic studies and mapping in Alaska. Some stratigraphic and locality information nevertheless remains unclear. PC number refer to collections catalogued in the U.S. Geological Survey Permian-Carboniferous catalog: UA specimen numbers refer to specimens stored at the University of Alaska at College, Alaska.
Report by: Charles L. Rowett
Age: Permian
Formation: Sadlerochit Group
Occurrence(s)
No. Group Name Qty Notes
1 Rugose Corals ?Duplophyllum sp.
2 Rugose Corals ?Pseudobradyphyllum sp.

Title: Report on Referred Fossils ,  1956 (05/23)
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.
Report by: J. Thomas Dutro , Jr.
Referred by: M. D. Mangus
Age: Permian (probably Permian)
Comment:This fauna appears to be related to one collected from the basal part of the Sadlerochit formation at several places in the eastern Brooks Range. The age is probably Permian.

Collection 53AMg3 (15425), from rocks thought to be equivalent to the Sadlerochit formation, is probably of Permian age.

Occurrence(s)
No. Group Name Qty Notes
1 Rugose Corals horn corals, undet.
2 Brachiopods Muirwoodia? sp.
3 Brachiopods Horridonia? sp.
4 Brachiopods Choristites sp.
5 Brachiopods Brachiopod, genus undet.