Sample Detail of
Sample: Sample No. 62AGz83 -- USGS No. Mesozoic loc. 28660
Locality: Field No. 62AGz83
Description: Hard siltstone. Lat. 62o 13'25" N., Long. 148o 01'37" W., (Coords. 15.25 - 15.55).
Location: Alaska Quadrangle: Talkeetna Mts A-3
Lat.: 62o13'25 " Long.: 148o01'37 "
Reference
Title: Report on Referred Fossils ,  1962 (09/19)
Fossils from the Talkeetna Formation in collections 62AGz80 and 80A do not contain fossils of age significance. Collections 62AGz84, 84A and 84B contain the ammonite Crucilobiceras which in Europe ranges from the upper Sinemurian into the basal Pliensbachian. It is associated in collection 84 and probably in 84A with Acanthopleuroceras which is characteristic of the lower Pliensbachian. Collection 62AGz83 contains the ammonite Radstockiceras which occurs in the lower Pliensbachian of Europe.

Please let me know if this data helps in dating the emplacement of the Talkeetna batholith. Also, when you find time, please send me a copy of the Talkeetna Mts. (A-3) quadrangle showing the locations of these fossil collections.
Report by: Ralph W. Imlay
Referred by: Arthur Grantz
Age: Pliensbachian (early Pliensbachian)
Formation: Talkeetna Formation
Comment:Collection 62AGz83 contains the ammonite Radstockiceras which occurs in the lower Pliensbachian of Europe.
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Radstockiceras sp.
2 Bivalves Goniomya sp.
3 Bivalves Pleuromya sp.
4 Brachiopods Brachiopods undetermined
5 Snails Gastropods undetermined