Sample Detail of
Sample: Sample No. 68ADu28 -- USGS No. USGS loc. 6748-CO
Locality: Field No. 68ADu28
Description: about one mile west of Don River. Several hundred yards south of measured section about equal to 6746-CO. [65o 29.5', 166o 56.6' (description from Oliver et al., 1975, p. 34)]
Location: Alaska Quadrangle: Teller B-4
Lat.: 65o29.5 ' Long.: 166o56.6 '
Reference
Title: Report on Referred Fossils ,  1970 (04/29)
Report by: John Pojeta
Referred by: J. Thomas Dutro , Jr. , C. L. Sainsbury
Age: Middle Ordovician (?Middle Ordovician)
Comment:This genus (Pojeta obviously referring to Tancrediopsis-R.B. Blodgett) is known from Middle and Upper Ordovician rocks from Nevada to New York, and has previously been tentatively identified from Alaska in HM-66-3D (66ASn443 =USGS loc. 6027-CO). The Alaskan species is very similar to T. takahashii from the Kangyao Formation of Manchuria. This suggests a pre-Barneveld Middle Ordovician age for the Alaskan rocks.
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Ctenodonta sp. 1 silicified fragment
2 Bivalves Cyrtodonta sp. 4 silicified fragmentary valves
3 Bivalves Tancrediopsis aff. T. takahashii (Endo)

Title: Ordovician, Silurian, and Devonian corals of Alaska ,  1975
Abstract

Corals are common in Ordovician, Silurian, and Devonian rocks from Alaska, but few have been described or illustrated. Most of the known occurrences of corals are in carbonate rocks, either in an east-west belt of shelf facies across central Alaska that presisted from pre-Ordovician to Middle Devonian time or in a more southerly volcanic graywacke belt of geosynclinal facies that includes significant limestone units in southeastern Alaska. Corals occur in other areas but are less well known.
Annotated lists of corals summarize most collections made by U.S. Geological Survey geologists in the last 15 years. Many of the corals are illustrated.
Report by: William A. Oliver , Jr. , C. W. Merriam , Michael Churkin , Jr.
Age: Late Ordovician
Comment:A second and much larger assemblage of corals is known from several collections. For convenience it is termed the Catenipora assemblage because specimens of one or more species of this genus occur in all known collections. The assemblage includes several elements of the Bighorn-Red River fauna of western and arectic North America, and several of the genera (marked* on table 2) are thought to be limited to rocks of Late Ordovician or younger age on a worldwide basis. With the present data Sainsbury's suggestion (in Sainsbury and others, 1971, p. 56-57) that these corals might be late Middle Ordovician seems untenable. (from Oliver et al., p. 23)
Occurrence(s)
No. Group Name Qty Notes
1 Tabulate Corals Catenipora sp. D