Sample Detail of
Sample: Sample No. 73Ast63
Locality: Field No. 73Ast63
Description: These fossils were colleccted from carbonate bodies in Amphitheater Group lavas. To date, the only age control we have for this extrusive unit are in the very uppermost part near Clearwater Gulch to the east. There, Halobia and Monotis document an Upper Triassic age. These collections are from the lowermost part of the flow sequence (107, 109) and the middle (63). I hope they may establish the onset of Triassic volcanism. No detailed geographic information given in E&R, but transmittal sheet has accompanying map which shows locality in NE1/4 Sec. 18, T33N, R9E of Talkeetna Mtns. D-3 quadrangle.
Location: Alaska Quadrangle: Talkeetna Mts D-3
Township&Range: T33N R9E Section: 18
Reference
Title: Report on Referred Fossils ,  1975 (05/19)
Report by: K. M. Nichols , Norman J. Silberling
Referred by: T. E. Smith
Age: Carnian-Norian (latest Carnian - early Norian)
Formation: Amphitheater Group
Comment:Age: By comparison with the occurrence of similar forms in southeast Alaska, these are of latest Karnian or early Norian age.
A few representative specimens are being retained in the P&S reference collection at Menlo Park. The remainder of the collection will be discarded, as requested.
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Halobia cf. H. symmetrica Smith