Upper Triassic, Alaska Range (USGS 18584) - Moffit (1954) (Triassic of the United States)

Also known as USGS 18584 (#40A Wa-F23)

Where: Southeast Fairbanks County, Alaska (62.5° N, 141.0° W: paleocoordinates 4.6° N, 73.0° 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
• Massive limestone and calcareous thin-bedded shale and argillite units

Size class: macrofossils

Reposited in the USGS

Collection methods: quarrying,

• Collected by F.H. 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 40683: authorized by Austin Hendy, entered by Austin Hendy on 27.06.2004, edited by Wolfgang Kiessling

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative of range of invertebrate groups
 Terebratulida -
Terebratulida indet.3 Waagen 1883
 Spiriferinida - Cyrtinidae
"Cyrtina" sp. Davidson 1858
 Spiriferinida - Spiriferinidae
 Pectinida - Limidae
Lima aff. kimballi Smith 1927 file clam
 Ostreida - Posidoniidae
Posidonia sp. Bronn 1828 oyster
 Ostreida - Halobiidae
Halobia sp. Bronn 1830 oyster
 Cidaroida -
Cidaroida indet. Claus 1880 pencil urchin
 Scleractinia - Reimaniphylliidae
? Retiophyllia sp.1 Cuif 1966 stony coral
 Scleractinia - Montlivaltiidae
? Isastrea sp.2 Milne-Edwards and Haime 1851 stony coral