Upper Triassic, Alaska Range (USGS 18354) - Moffit (1954) (Triassic of the United States)

Also known as USGS 18354(#40A Wa-F4)

Where: Valdez-Cordova County, Alaska (62.4° N, 143.0° W: paleocoordinates 5.0° N, 73.9° 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.

• bed-level stratigraphic resolution

Environment/lithology: marine; limestone

• 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
• Specifically: "limestone". Massive limestone and calcareous thin-bedded shale and argillite units

Size class: macrofossils

Reposited in the USGS

Collection methods: quarrying,

• Collected by R.G. Wayland (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 40682: 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 - Dimyidae
Dimyodon storrsi Smith 1927 scallop
 Pectinida - Aviculopectinidae
? Aviculopecten sp. M'Coy 1851 scallop
 Ostreida - Bakevelliidae
? Gervillia sp. Defrance 1820 oyster
 Cardiida - Kalenteridae
Myoconcha cf. nana Smith 1927 clam