Upper Triassic, Alaska Range (USGS 18084) - Moffit (1954) (Triassic of the United States)

Also known as USGS 18084(#38A M-F3)

Where: Southeast Fairbanks County, Alaska (63.2° N, 142.4° W: paleocoordinates 38.3° N, 60.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• Specifically: "limestone boulder in conglomerate". 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 time.
• Specifically: "limestone". Massive limestone and calcareous thin-bedded shale and argillite units

Size class: macrofossils

Reposited in the USGS

Collection methods: quarrying,

• Collected by Moffit (1938)

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 40676: 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
Cephalopoda
 Ceratitida - Arcestidae
Arcestes sp. Suess 1865 ceratite
 Ceratitida - Trachyceratidae
"Trachyceras (Protrachyceras) cf. beckeri" = Spirogmoceras shastense
"Trachyceras (Protrachyceras) cf. beckeri" = Spirogmoceras shastense Smith 1904 ceratite