Sample Detail of
Sample: Sample No. 49AGz35 -- USGS No. Mesozoic loc. 21783
Locality: Field No. 49AGz35
Description: Naknek formation, from upper half of the massive sandstone beds of the lower Naknek just below the black, limy siltstone of the middle Naknek, 0.7 miles west of Gull Island on south shore of Chinitna Bay. (description from Imlay E&R report of 1/16/50)[Grantz transmittal sheet of Nov. 23, 1949 provides following description: "Ammonite (Phylloceras?) from the upper half of the massive sandstone beds of the lower Naknek, immediately below the black limey siltstone of the middle Naknek, 0.7 miles of west of Gull Island, south shore."][Shown as locality 310 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59o 49'51" N., 153o 00'28" W.];Arthur Grantz, 1949. South shore of Chinitna Bay, 1 km west of Gull Island and 0.3 km southwest of Mesozoic 1oc.-21351. Naknek Formation, unnamed lower sandstone member, 244 m above base. Early Oxfordian. (description from Imlay, 1981, USGS PP 1190, p. 25); [USGS Mes. Cat.: Orig. no. 49AGz35. Jurassic-Naknek Fm. Cook Inlet Region, west side of Cook Inlet & Chinitna Bay district, NE1/4, NW1/4, NW1/4 Quadrangle 585, Alaska. Ammonite (Phylloceras) from the upper half of the massive sandstone beds of the lower Naknek, immediately below the ??? limey siltstone of the Middle Naknek, 0.7 miles west of Gull Island, south shore. Coll. Grantz, 1949.]
Location: Alaska Quadrangle: Iliamna D-1
Lat.: 59o49'51 " Long.: 153o00'28 "
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.

........

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: Late Jurassic
Formation: Naknek Formation - lower sandstone member (lower sandstone member)
Comment:Geographic location: Chinitna Bay area
Map reference (pl. 3): 310
Stratigraphic position below top of formation (ft): 800
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 (early Oxfordian)
Formation: Naknek Formation (unnamed lower sandstone member of Naknek Formation)
Comment:Shown as loc. 8 on Fig. 1; also shown on Figure 6 and Tables 2 and 5
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras iniskinense Imlay specimen from this locality illustrated on Pl. 3, figs. 1, 8