McDonell Lake, Ashman Formation, bed M3 (Jurassic of Canada)

Where: British Columbia, Canada (54.8° N, 127.6° W: paleocoordinates 40.6° N, 70.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ashman Formation, Bathonian (168.3 - 166.1 Ma)

• Bathonian-late Bathonian, approx 40 m above the base of the section

• bed-level stratigraphic resolution

Environment/lithology: marine; green, yellow sandstone and tuffaceous sandstone

• strata are disrupted by block faults in the vicintity of McDonell Lake
• well-bedded, fossiliferous, green to buff, lithic sandstone, strongly reworked tuff or tuffaceous 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 37609: authorized by John Alroy, entered by Erin Leckey on 18.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Kosmoceratidae
Kepplerites sp., "Kepplerites ex gr. tychonis" = Kepplerites (Seymourites) tychonis
Kepplerites sp. Neumayr and Uhlig 1892 ammonite
K. (Toricellites) sp.
"Kepplerites ex gr. tychonis" = Kepplerites (Seymourites) tychonis Ravn 1911 ammonite
 Ammonitida - Sphaeroceratidae
Iniskinites sp. Imlay 1975 ammonite
I. or Lilloettia sp. juvenile
Xenocephalites cf. vicarius Imlay 1953 ammonite
 Ammonitida - Reineckeiidae
? Parareineckeia sp. Imlay 1962 ammonite