USGS Mesozoic 20760, Iniskin Peninsula (Jurassic of the United States)

Where: Alaska (59.7° N, 153.3° W: paleocoordinates 31.5° N, 86.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Chinitna Formation, Callovian (166.1 - 163.5 Ma)

• Chinitna formation, middle third.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

Size class: macrofossils

Collected by C.E. Kirschner in 1946; reposited in the USNM

Primary reference: R. W. Imlay. 1953. Callovian (Jurassic) ammonites from the United States and Alaska Part 2. Alaska Peninsula and Cook Inlet regions. United States Geological Survey Professional Paper 249-B:41-108 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 158891: authorized by Matthew Clapham, entered by Matthew Clapham on 22.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Oppeliidae
"Oppelia (Oxycerites) sp." = Oxycerites
"Oppelia (Oxycerites) sp." = Oxycerites ammonite
 Ammonitida - Tulitidae
Kheraiceras varicostatum n. sp. Imlay 1953 ammonite