Where: Alaska (57.7° N, 155.4° W: paleocoordinates 10.8° N, 82.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Columbiae ammonoid zone, Talkeetna Formation, Bucklandi (196.5 - 189.6 Ma)

• Canadensis regional ammonoid zones

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, calcareous sandstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: surface (in situ),

Primary reference: J. Pálfy, P. L. Smith, J.K. Mortensen and R.M. Friedman. 1999. Integrated ammonite biochronology and U-Pb geochronometry from a basal Jurassic section in Alaska. Geological Society America Bulletin 111(10):1537-1549 [J. Pálfy/M. Bosnakoff]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 68727: authorized by József Pálfy, entered by Mariann Bosnakoff on 05.02.2007, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)