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), this sample comes from 210 m above the other Ashman Ridge collection
• bed-level stratigraphic resolution
Environment/lithology: marine; tuff and shelly/skeletal sandstone
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 37505: authorized by John Alroy, entered by Erin Leckey on 15.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Asteroceras varians" = Hypasteroceras planulatum
"Asteroceras varians" = Hypasteroceras planulatum Fucini 1903 ammonite |