Sample Detail of
Sample: Sample No. F-74 -- USGS No. Mesozoic loc. 20007
Locality: Field No. F-74
Description: [Shown as locality 145 on Pl. 3 of Detterman and Hartsock, 1966][Entry (card) in USGS Mesozoic Fossil Locality register (Washington, D.C.) provides following description: "Middle Jurassic-Tuxendi, Tonnie Siltstone. Orig. no. F-74. SW Alaska, Cook Inlet region, Iniskin Peninsula. Northeast side of Tonnie Creek about 350 feet upstream from the second falls and 0.78 miles S 54o E of Tonnie Peak, about 100 feet above stream level. 30 feet above the base of the Tonnie member of the Chinitna formation. Ferruginous sandstone series. Collection by Kellum and Wedow, Oct. 3, 1944."]
Location: Alaska Quadrangle: Iliamna D-1
Reference
Title: Geology of the Iniskin-Tuxedni Region, Alaska [last half of single issue publication] ,  1966
Report by: Robert L. Detterman , John K. Hartsock
Age: Bathonian-Callovian (late Bathonian - Callovian)
Formation: Bowser Formation
Comment:Geographic location: Tonnie Creek
Map reference (pl. 3): 145
Stratigraphic position below top of formation (ft): 700-725
all above data from Table 9, p. 39
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Trigonia sp.
2 Bivalves Pleuromya sp.
3 Bivalves Thracia sp.