USGS Mesozoic 22437, Iniskin Peninsula (Jurassic of the United States)

Where: Alaska (59.8° N, 153.1° W: paleocoordinates 31.6° N, 86.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• Massive sandstone at base of Chinitna formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Collected by J.K. Hartsock in 1950; 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 158692: authorized by Matthew Clapham, entered by Matthew Clapham on 21.07.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Cardioceratidae
"Cadoceras catostoma" = Cadoceras (Pseudocadoceras) catostoma
"Cadoceras catostoma" = Cadoceras (Pseudocadoceras) catostoma Pompeckj 1900 ammonite
 Ammonitida - Sphaeroceratidae
Xenocephalites vicarius n. sp. Imlay 1953 ammonite