A marginal marine fauna from the upper Dinosaur Park Formation, Canada
DOI:
https://doi.org/10.18435/vamp29410Keywords:
Alberta, Campanian, Cretaceous, palaeoecology, Acanthomorpha, Elasmobranchii, Teleostei, Judish River Formation, Belly River GroupAbstract
During the Late Cretaceous, the coastline of the epicontinental Western Interior Seaway in North America fluctuated in position, temporarily replacing some terrestrial ecosystems with shallow marine habitats.
In southeastern Alberta, the uppermost portion of the Dinosaur Park Formation (Belly River Group, late Campanian) preserves one of these transgression–regression cycles in a marine wedge named here as the
Johnson Unit. We report the stratigraphy of the unit based on nine stratigraphic sections over several kilometres of exposure. We describe a diverse assemblage of marine vertebrates from the Johnson Unit, represented by microfossils from a surface collecting survey. Our sample includes 1431 specimens, which we assign to 40 taxa. We identify eight new actinopterygians from the unit: Belonostomus longirostris, Amiidae indet.,
Elopiformes indet., Horseshoeichthys sp., Enchodus gladiolus, Dercetis cf. D. magnificus, Acanthomorpha indet., and teleost indet. type O. The acanthomorph specimens, which include isolated spines and centra, represent the second marine Cretaceous acanthomorph reported from Alberta, and the highly ornamented spines are unlike any previously described. We revise several chondrichthyan identifications from previous authors and describe partial tooth plates from the chimaeriform Ischyodus bifurcatus for the first time in Canada. Compared to earlier samples from the same unit that were collected using screen-washing, our sample has a
higher diversity of actinopterygians and tetrapods. We identify several taxa to lower taxonomic levels using more complete specimens. These differences are attributed to our use of surface collection; this method allowed novel biogeographic and taxonomic insights.
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