Sample Detail of
Sample: Sample No. 49AMr38 -- USGS No. Mesozoic loc. 21768
Locality: Field No. 49AMr38
Description: Tuxedni formation, middle siltstone member. 50 to 150 feet below top of member on south bank of Fitz Creek, 2.35 miles S. 2o E. of Tonnie Peak, Iniskin Peninsula. (description from Imlay E&R report of 1/16/50)[Grantz transmittal sheet of Nov. 23, 1949 provides following description: "100 foot interval of middle siltstone member of the Tuxedni formation, 50-150 feet below the top of the member; outcrop on south bank of Fitz Creek, 2.35 miles S. 2o E. of Tonnie Peak."][Shown as locality 106 on Pl. 3 of Detterman and Hartsock, 1966]
Location: Alaska Quadrangle: Iliamna C-1
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: Tuxedni Group (Tuxedni formation, lower siltstone member)
Comment:Tuxedni formation
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Chondroceras (Defonticeras) sp.
2 Ammonoids Stephanoceras spp.

Title: Geology of the Iniskin-Tuxedni Region, Alaska ,  1966
Report by: Robert L. Detterman , John K. Hartsock
Age: Bajocian (middle Bajocian)
Formation: Fitz Creek Siltstone
Comment:Geographic location: Fitz Creek area
Map reference (pl. 3): 106
Stratigraphic position below top of formation (ft): 1050-1100
all above data from Table 6, p. 33
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Chondroceras allani (McLearn)
2 Ammonoids Normannites (Itinsaites) variabilis Imlay