Sample Detail of
Sample: Sample No. 49AGz33 -- USGS No. Mesozoic loc. 21777
Locality: Field No. 49AGz33
Description: Chinitna formation, lower part of upper member, 1.2 to 1.3 miles west of Gull Island on south shore of Chinitna Bay, Iniskin Peninsula. (description from Imlay E&R report of 1/16/50)[Grantz transmittal sheet of Nov. 23, 1949 provides following description: "Macrofossils from the siltstone with thin lime and lime concretion beds of the lower part of the upper Chinitna 1.2 to 1.3 miles west of Gull Island, south shore of Chinitna Bay."][Detterman and Hartsock, 1966, p. 48 (faunal list), loc. 297 on Pl. 3][Shown as locality 297 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59o 50'01" N., 153o 01'20" W.]; [A. Grantz, 1949. Iniskin Peninsula, south shore of Chinitna Bay from 1.2 to 1.3 miles west of Gull Island from siltstone and thin limestones in the lower part of the upper third of the Chinitna formation. (description from Imlay, 1953, p. 66)]
Location: Alaska Quadrangle: Iliamna D-1
Lat.: 59o50'01 " Long.: 153o01'20 "
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: Chinitna Formation (Chinitna Formation, lower part of upper member)
Comment:Chinitna formation
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Cosmoceras? sp.
2 Ammonoids Pseudocadoceras spp.
3 Ammonoids Phylloceras spp.
4 Belemnites Belemnite fragments
5 Snails Gastropods indetermined
6 Bivalves Grammatodon sp.
7 Bivalves Camptonectes 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: Callovian
Formation: Chinitna Formation - Paveloff Siltstone Member (Paveloff Siltstone Member)
Comment:Geographic location: Chinitna Bay area
Map reference (pl. 3): 297
Stratigraphic position below top of formation (ft): 850
all above data from Table 11, p. 48
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Grammatodon sp.
2 Bivalves Camptonectes sp.
3 Snails Gastropods (undet.)
4 Ammonoids Phylloceras bakeri Imlay
5 Ammonoids Cadoceras (Stenocadoceras) multicostatum Imlay
6 Ammonoids Cadoceras (Stenocadoceras) stenoloboide Pompeckj
7 Ammonoids Pseudocadoceras chinitnense Imlay
8 Ammonoids Cosmoceras(?) sp.
9 Belemnites Belemnite fragments

Title: Callovan (Jurassic) ammonites from the United States and Alaska. Part 2. Alaska Peninsula and Cook Inlet Regions. USGS Proferssional Paper 249-B ,  1953
Report by: Ralph W. Imlay
Age: Callovian
Formation: Chinitna Formation
Comment:Shown as locality 25 on Figure 6.

Illustrated specimens: Cadoceras (Stenocadoceras) stenoloboide Pompeckj - Plesiotype, USNM 108109, Pl. 47, fig. 11; Pseudocadoceras chinitense Imlay, n. sp. - Holotype, USNM 108120, Pl. 48, figs. 9, 10

Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras (Phylloceras) bakeri Imlay, n. sp.
2 Ammonoids Cadoceras (Stenocadoceras) multicostatum Imlay, n. sp.
3 Ammonoids Cadoceras (Stenocadoceras) stenoloboide Pompeckj Illustrated specimen: Plesiotype, USNM 108109, Pl. 47, fig. 11
4 Ammonoids Pseudocadoceras chinitnense Imlay, n.sp. Illustrated specimen: Holotype, USNM 108120, Pl. 48, figs. 9, 10