Where: Alaska (57.3° N, 156.4° W: paleocoordinates 27.2° N, 87.5° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Kialagvik Formation, Early/Lower Bajocian (171.6 - 168.4 Ma)
• 21 m dark grey shale with abundant calcareous black concretions, often in bedding planes and forming a thick "bed" at 10.5 m above base of section; highly fossiliferous throughout; Pseudocidoceras zonule.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified, concretionary shale
Size class: macrofossils
Collected by G.E.G. Westermann, P. Hubbard in 1964
• Repository: McMaster University (Hamilton, Ontario, Canada)
Primary reference: G. E. G. Westermann. 1969. The ammonite fauna of the Kialagvik Formation at Wide Bay, Alaska Peninsula. Part II. Sonninia sowerbyi zone (Bajocian). Bulletins of American Paleontology 57:1-226 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 175648: authorized by Matthew Clapham, entered by Matthew Clapham on 24.12.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Partschiceras ellipticum Westermann 1969 ammonite | |
Docidoceras (Pseudocidoceras) aff. widebayense Westermann 1969 ammonite | |
Sonninia (Alaskoceras) alaskensis n. sp. Westermann 1969 ammonite
Sonninia (Euhoploceras) bifurcata Westermann 1969 ammonite |