Sample Detail of
Sample: Sample No. 49AMr37 -- USGS No. Mesozoic loc. 21767
Locality: Field No. 49AMr37
Description: Tuxedni formation, middle siltstone member. Probably same stratigraphic position as 48AMr147 (Mes. loc. 21304) but on opposite flank of anticline. On south bank of Fitz Creek, 2.45 miles S. 10o E. of Tonnie Peak, Iniskin Peninsula. (description from Imlay E&R report of 1/16/50)[Transmittal sheet of Grantz, dated Nov. 23, 1949, provides following description: "Outcrop of middle siltstone member of Tuxedni formation near axis of anticline, south bank of Fitz Creek, 2.46 miles S. 10o E. of Tonnie Peak. Should be same stratigraphic horizon as lot 21304 (48AMr147) but on opposite flank of anticline."][Detterman and Hartsock, 1966, p. 32 (faunal list), loc. 78 on Pl. 3][Shown as locality 78 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, middle siltstone member)
Comment:Tuxedni formation
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Chondroceras (Defonticeras) sp.
2 Ammonoids Normannites sp.
3 Ammonoids Teloceras sp.
4 Bivalves Oxytoma sp.
5 Snails Gastropods undetermined

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): 78
Stratigraphic position below top of formation (ft): 400-450
all above data from Table 6, p. 32
Occurrence(s)
No. Group Name Qty Notes
1 Snails Gastropods undet.
2 Bivalves Oxytoma sp.
3 Ammonoids Chondroceras cf. C. defontii (McLearn)
4 Ammonoids Normannites sp.
5 Ammonoids Zemistephanus cf. Z. richardsoni (Whiteaves)