USGS Mesozoic loc. 19986 (Jurassic of the United States)

Where: Alaska (59.8° N, 153.2° W: paleocoordinates 28.8° N, 84.9° W)

• coordinate based on nearby landmark

When: Red Glacier Formation (Tuxedni Group), Bajocian (170.3 - 168.3 Ma)

• 19951 - Bajocian, 0 to 3 m (0-10 ft) below top of Red Glacier Formation (Detterman and Hartsock, 1966)

Environment/lithology: marine; lithified, coarse-grained, brown, gray siltstone and lithified, concretionary limestone

• From Detterman and Hartsock, 1966: "Siltstone, thin-bedded, coarse-grained, brownishgray; thin interbeds of very fine grained sandstone; large limestone concretions in upper part; porphyritic andesite sill near middle of unit; many thin coquina beds containing Witchellia, Parabigotites, Holcophylloceras, and the pelecypods Meleagrinella, Trigonia, and Inoceramus"

Size classes: macrofossils, mesofossils

Preservation: coquina

Collected by H. Wedow and L.B. Kellum in 1944; reposited in the USNM

Primary reference: T. P. Poulton. 1979. Jurassic Trigoniid Bivalves from Canada and Western United States of America. Geological Survey of Canada Bulletin 282 [G. Stanley/H. Shepherd/H. Shepherd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 139546: authorized by George Stanley, entered by Hannah Shepherd on 13.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Trigoniida - Myophorelloidae
Myophorella argo Crickmay 1930 clam