Where: Alberta, Canada (49.6° N, 112.8° W: paleocoordinates 57.2° N, 78.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Bearpaw Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Because the specimens were collected during commercial ammonite mining, their exact stratigraphic position is generally unknown. The ammonites from the Lethbridge area are commonly found and mined from two horizons within the Bearpaw Formation, Zone 4 and K Zone. These horizons correlate with Muddy Unit 1 (Baculites compressus zone) and Muddy Unit 2 (B. cuneatus zone) respectively (Link and Childerhose, 1931; Tsujita, 1995; Mychaluk et al., 2001). Both units are dated with 40Ar/39Ar analyses as being in the middle of the late Campanian, and the B. cuneatus zone is estimated to be younger with the approximate age of 72.32–73.35 Ma (Izett et al., 1998; Cobban et al., 2006).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, concretionary shale

Size class: macrofossils

Reposited in the TMP

Primary reference: M. Chida, D. B. Brinkman, and A. M. Murray. 2023. A large, new dercetid fish (Teleostei: Aulopiformes) from the Campanian Bearpaw Formation of Alberta, Canada. Cretaceous Research 150(105579) [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 230440: authorized by Matthew Clapham, entered by Matthew Clapham on 20.06.2023

Creative Commons license: CC BY (attribution)