Sample Detail of
Sample: Sample No. 61ADt44
Locality: Field No. 61ADt44
Description: Lower Naknek formation; massive siltstone about 200-300 feet above contact with Chisik Member; along shore of Cook Inlet between Ursus Cove and Iliamna Bay; 0.6 mile N. 42o E. of south tip of Ursus Head. Coords. 6.0-4.03; C2 quad; 59o 33'28" N., 153o 34'50" W. [Note by R.B. Blodgett, the 8 on 28" Lat. is indistinct, may also be 23"]. Detterman and Reed (1980, p. B39 - Table 2) provide the following information: Fortification Bluff area. Snug Harbor Siltstone Member of Naknek Formation. Shown as locality 5 on Plate 1]
Location: Alaska Quadrangle: Iliamna C-2
Lat.: 59o33'28 " Long.: 153o34'50 "
Reference
Title: Report on Referred Fossils ,  1961 (11/13)
Report by: Ralph W. Imlay
Referred by: Robert L. Detterman
Age: Late Jurassic
Formation: Naknek Formation
Comment:All the collections submitted contain fragments of phragmocones and guards of belemnites. One guard from locality 61-ADt-44 probably belongs to Pachyteuthis. In addition locality 61-ADt-45 contains Phylloceras sp. Both localities 61-ADt-45 and 61AHe-55 contain Buchia concentrica (Sowerby). This species elsewher in the Cook Inlet area occurs at and near the base of the Naknek. From your previous studies you are aware of its range in the Boreal region and its age significance.
Occurrence(s)
No. Group Name Qty Notes
1 Belemnites belemnites
2 Belemnites one guard probably belongs to Pachyteuthis

Title: Stratigraphy, Structure, and Economic Geology of the Iliamna Quadrangle, Alaska ,  1980
Report by: Robert L. Detterman , Bruce Reed
Age: Late Jurassic
Formation: Naknek Formation - Snug Harbor Siltstone Member (Snug Harbor Siltstone Member of the Naknek Formation)
Comment:Faunal list given on p. B39 - Table 2
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Quenstedtia sp.