Sample Detail of
Sample: Sample No. 49AMr42 -- USGS No. Mesozoic loc. 21771
Locality: Field No. 49AMr42
Description: Tuxedni formation, middle siltstone member. Upper part, from southeast side of Fitz Creek, 2.8 miles N. 71o 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: "Microfossils from siltstone outcrop on SE of Fitz Creek, 2.8 miles N 71 E of Tonnie Peak. Field relations indicate upper part of middle siltstone member of the Tuxedni formation."][Shown as locality 117 on Pl. 3 of Detterman and Hartsock, 1966]
Location: Alaska Quadrangle: Iliamna D-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.

........

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, middle siltstone member)
Comment:Tuxedni formation
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Chondroceras (Defonticeras) sp.
2 Bivalves Grammatodon sp.
3 Brachiopods Rhynchonellid brachiopod undetermined

Title: Geology of the Iniskin-Tuxedni Region, Alaska ,  1966
Report by: Robert L. Detterman , John K. Hartsock
Age: Bajocian (Bajocian (no younger than early late Bajocian))
Formation: Cynthia Falls Sandstone
Comment:Geographic location: Bowser Creek-Fitz Creek area
Map reference (pl. 3): 117
Stratigraphic position below top of formation (ft): 0-150
all above data from Table 7, p. 34
Occurrence(s)
No. Group Name Qty Notes
1 Brachiopods Rhynchonellid brachiopod
2 Bivalves Grammatodon sp.
3 Ammonoids Chondroceras defontii (McLearn)