Where: Alberta, Canada (53.6° N, 113.4° W)

• Paleocoordinates: 64.0° N, 65.3° W (Wright 2013)

• coordinate stated in text

When: Drumheller Member (Horseshoe Canyon Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

• A circular style scan of the specimen was attempted with an industrial, cabinet-based micro-CT scanner (Nikon XTH 225 ST) using a tungsten rotating reflection target source coupled with a 16-bit2000×2000 pixel detector; however, the bone and rock density unfortunately did not allow any useful information to be found. Manual preparation of the fossil consisted of washes of water and 5% acetic acid to remove loose matrix. Unfortunately, the matrix is not easily removed, and complete preparation, particularly of the interior of the nodule, has not been feasible. The specimen is cataloged in the University of Alberta Laboratory for Vertebrate Paleontology (UALVP) under catalog number UALVP 62007.

Collected by Anastasia Pavlic and Cal Kiejko in 10/17/2022

• The specimen was found by Anastasia Pavlic and Cal Kiejkoon October 17, 2022, on the south side of the North Saskatchewan River, downstream from the bridge at 75th Street at water level. Although initially thought (and hoped) to be preserved dinosaur skin, closer examination showed it to be the partial skull of a large sturgeon. The specimen is in a boulder that has split into four pieces (three large and one small), but the four fit back together with essentially no gaps

Primary reference: A. M. Murray, L. E. Nelson, and D. B. Brinkman. 2023. A new sturgeon from the Upper Cretaceous Horseshoe Canyon Formation in central Alberta, Canada. Journal of Vertebrate Paleontology [M. Uhen/I. Giblin]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 231935: authorized by Mark Uhen, entered by Indigo Giblin on 04.10.2023

Creative Commons license: CC0 (CC0)