Ashman Ridge 1, Telkwa Formation (Jurassic of Canada)

Where: British Columbia, Canada (54.8° N, 127.2° W: paleocoordinates 26.7° N, 69.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Telkwa Formation, Sinemurian (199.3 - 190.8 Ma)

• late Sinemurian (lower boundary not known), ammonites from approx 120 m above the base of the section

• bed-level stratigraphic resolution

Environment/lithology: marine; tuff

• non-welded volcanic tuff is primary component, unknown what lithology ammonites were found in

Size class: macrofossils

Primary reference: J. Palfy, P. L. Smith, and J. K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37(6):923-944 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37503: authorized by John Alroy, entered by Erin Leckey on 15.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Asteroceratidae