Sample Detail of
Sample: Sample No. 49AHa69 -- USGS No. Mesozoic loc. 21773
Locality: Field No. 49AHa69
Description: Tuxedni formation, Bowser member. From boulder on tidal meadow at base of Cynthia Falls sandstone, 1 1/2 miles northeast of mouth of Fitz Creek, Iniskin Peninsula. (description from Imlay E&R report of 1/16/50)[Grantz transmittal sheet of Nov. 23, 1949 provides following description: "Ammonites from boulder on tidal meadow at base of Cynthia Falls sandstone 1 1/2 miles northeast of mouth of Fitz Creek. Collected by Don J. Miller. Cranocephalites or Defonticeras? Page 67, September 13, 1949][Shown as locality 191 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59o 48'58" N., 153o 06'34" W.]
Location: Alaska Quadrangle: Iliamna D-1
Lat.: 59o48'58 " Long.: 153o06'34 "
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: Bowser Formation (Bowser member of Tuxedni Formation)
Comment:Tuxedni formation.

Lot 49AHa69 (Mes. loc. 21773) contains Cranocephalites rather than Chondroceras (Defonticeras) as shown by the gradual change of ribbing on the outer whorl and by the trifid second lateral lobe.

Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Cranocephalites spp.

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: Bowser Formation
Comment:Geographic location: Gaikema Creek area
Map reference (pl. 3): 191
Stratigraphic position below top of formation (ft): float
all above data from Table 9, p. 39
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Kheraiceras sp.
2 Ammonoids Xenocephalites hebetus Imlay