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)