Upper Triassic, Alaska Range (USGS 18336) - Moffit (1954) (Triassic of the United States)

Also known as USGS 18336(#40A M-F3)

Where: Valdez-Codrova County, Alaska (62.2° N, 143.2° W: paleocoordinates 4.8° N, 74.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Late/Upper Triassic (237.0 - 201.3 Ma)

• Limestone, massive and crystalline, overlain by thin-bedded limestone; maximum known thickness is 1200 feet; includes some black shale, as shales on Snag River

• bed-level stratigraphic resolution

Environment/lithology: marine; limestone and calcareous shale

• Upper Triassic limestone and shale were deposited unconformably on the older rocks and in turn wre elevated above sea level, folded and partly eroded in early Jurassic time.
• Massive limestone and calcareous thin-bedded shale and argillite units

Size class: macrofossils

Reposited in the USGS

Collection methods: quarrying,

• Collected by Moffit (1940)

Primary reference: F.H. Moffit. 1954. Geology of the eastern part of the Alaska Range and adjacent area. United States Geological Survey Professional Paper 989(D) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 40677: authorized by Austin Hendy, entered by Austin Hendy on 27.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of range of invertebrate groups
Bivalvia
 Pectinida - Monotidae