Sample Detail of
Sample: Sample No. 49AGz45 -- USGS No. Mesozoic loc. 21786
Locality: Field No. 49AGz45
Description: Naknek formation, probably same locality as preceding 49AGz37, but label was separated in transit. (description from Imlay E&R report of 1/16/50)[Grantz transmittal sheet of Nov. 23, 1949 provides following description: "Ammonite probably from the limey siltstone of the middle Naknek 0.6 miles west of Gull Island, south shore of Chinitna Bay. (Separated from label in transit)."][Shown as locality 313 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59o 49'47" N., 153o 00'07" W.]; Arthur Grantz, 1949. South shore of Chinitna Bay, 1 km west of Gull Island, a little southeast of Mesozoic loc. 21783 in the same section, Iliamna (D-1) Quadrangle. Naknek Formation. Snug Harbor Siltstone Member. 183 m above base, Oxfordian. (description from Imlay, 1981, USGS PP 1190, p. 25); [USGS Mes. Cat.: Orig. no. 49AGz45. Jurassic-Naknek. Same geographical locality as No. 21783. Ammonite probably from the limey siltstone of the Middle Naknek. 0.6 miles west of Gull Island, South shore - Chinitna. Coll. Grantz, 1949.]
Location: Alaska Quadrangle: Iliamna D-1
Lat.: 59o49'47 " Long.: 153o00'07 "
Reference
Title: Report on Referred Fossils ,  1950 (01/16)
Title: Report on Jurassic fossils from west side of Cook Inlet, southwestern Alaska, submitted by John A. Hartsock and Don Miller, December 15, 1949 (AF-49-10) Examination has been made of the collections of Jurassic fossils made in 1949 along the west side of Cook Inlet by Miller, Hartsock, and Grantz. There is no question concerning the age or stratigraphic position of most of the collections but a few require comment.

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None of the other lots present any age problems. I hope to complete describing the Callovian ammonites early this spring and at that time will sent you a summary of conclusions.
Report by: Ralph W. Imlay
Referred by: John K. Hartsock , Don J. Miller , Arthur Grantz
Age: Jurassic (Jurassic, no further definitive age is given in E&R report)
Formation: Naknek Formation
Comment:Naknek formation
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras sp.

Title: Geology of the Iniskin-Tuxedni Region, Alaska [last half of single issue publication] ,  1966
Report by: Robert L. Detterman , John K. Hartsock
Age: Oxfordian-Kimmeridgian (late Oxfordian - middle Kimmeridgian (age range suggested for entire member))
Formation: Naknek Formation - Snug Harbor Siltstone Member (Snug Harbor Siltstone Member)
Comment:Geographic location: Chinitna Bay
Map reference (pl. 3): 313
Stratigraphic position below top of formation (ft): 600
all above data from Table 12, p. 51
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras sp.

Title: Late Jurassic Ammonites from Alaska ,  1981
Report by: Ralph W. Imlay
Age: Oxfordian
Formation: Naknek Formation - Snug Harbor Siltstone Member (Snug Harbor Siltstone Member of the Naknek Formation)
Comment:Shown as loc. 8 on Fig. 1; also shown on Fig. 6 and Tables 2 and 5
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras iniskinense Imlay