USGS Mesozoic loc. M6674 (Triassic of the United States)

Also known as field No. 68ATo18

Where: Alaska (69.0° N, 148.1° W: paleocoordinates 54.6° N, 47.7° W)

• coordinate stated in text

When: Shublik Formation, Norian (228.0 - 208.5 Ma)

Environment/lithology: marine; lithified, black shale and lithified, concretionary limestone

• "In outcrops of the North Slope subterrane in northeastern Alaska, as at localities 3 and 4 (fig. 1), Monotis occurs in black, sooty shale and concretionary limestone at the top of the Shublik Formation and in the basal meter, or so, of the overlying Karen Creek Sandstone as described by Detterman

•and others (1975)"

•This locality is estimated to be at about Locality 4 in Fig. 1 of Silberling et al 1997.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by H. A. Tourtelot in 1968; reposited in the USGS

Primary reference: N. J. Silberling, J. A. Grant-Mackie, and K. M. Nichols. 1997. The Late Triassic bivalve Monotis in accreted terranes of Alaska. United States Geological Survey Bulletin 2151:1-21 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 139027: authorized by George Stanley, entered by Hannah Shepherd on 07.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Pectinida - Monotidae
Monotis (Eomonotis) ? jakutica, Monotis (Eomonotis) obtusicostata
Monotis (Eomonotis) ? jakutica Teller 1896 scallop
Monotis (Eomonotis) obtusicostata Westermann 1966 scallop