Sample: |
Sample No. 49AGz35 -- USGS No. Mesozoic loc. 21783
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Locality: |
Field No. 49AGz35
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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 " |
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Reference
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Title: |
Report on Referred Fossils
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1950
(01/16)
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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
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Referred by: |
John K. Hartsock
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Don J. Miller
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Arthur Grantz
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| Age: | Jurassic (Jurassic, no further definitive age is given in E&R report) |
Formation: | Naknek Formation |
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Comment: | Naknek formation |
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