Sample Detail of
Sample: Sample No. 67ACx 190 -- USGS No. Paleobot. loc. 11120
Locality: Field No. 67ACx 190
Description: Alaska. Healy B-6 quad., Dunkel coal mine. Sec. 17, T. 19 S., R. 11 W., lat. 63o 16.2' N., long. 149o 31.8' W. Coll: Allen L. Clark. (Please give lat. and long. in future request for fossil examination and submit topographic map).
Location: Alaska Quadrangle: Healy B-6
Township&Range: T19S R11W Section: Sec.17
Lat.: 63o16.2 ' Long.: 149o31.8 '
Reference
Title: Report on Referred Fossils ,  1967 (10/26)
Report by: Jack A. Wolfe
Referred by: Allen L. Clark
Age: Oligocene
Comment:Age: The Cercidiphyllum indicates an age no older than middle Oligocene. The other dictyledons have been found in floras of middle or late Oligocene age, and particularly the Alnus and Corylus are diagnostic of the middle and late Oligocene in Alaska. In relation to the Kenai Formation, your rocks would be equivalent to the "lower(?) Seldovian" of Prof. Paper 398-A, which we now think to be pre-Seldovian. Your rocks are thus correlative with the Tsadaka Formation and the lower part of the Kenai Formation. The rocks from the Nenana coal field are probably younger.
Occurrence(s)
No. Group Name Qty Notes
1 Plants Metasequoia glyptostroboides Hu & Cheng
2 Plants Populus n. sp.
3 Plants Alnus evidens (Holl.) Wolfe
4 Plants Corylus harrjinani Knowl.
5 Plants Cercidiphyllum crenatum (Ung.) R.W. Br.