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GEOREF RECORD

An elasmobranch assemblage from the terrestrial-marine transitional Lethbridge Coal zone (Dinosaur Park Formation; upper Campanian), Alberta, Canada

Neil R. Beavan and Anthony P. Russell
An elasmobranch assemblage from the terrestrial-marine transitional Lethbridge Coal zone (Dinosaur Park Formation; upper Campanian), Alberta, Canada
Journal of Paleontology (May 1999) 73 (3): 494-503

Abstract

The change in depositional environments observed in the Cretaceous (Upper Campanian) strata in the region of Dinosaur Provincial Park, Alberta, from the proximal coastal plain deposits of the Oldman Formation to the lowland coastal plain deposits of the Dinosaur Park Formation, reveals an associated change in faunal composition. An assemblage collected from a microvertebrate site in the paralic deposits of the Lethbridge Coal Zone (uppermost Dinosaur Park Formation) reflects an increasing marine influence. Elasmobranch (sharks and rays) remains are the most abundant, both in terms of number of overall taxa and number of elements, and they are the best-preserved specimens. However, several brackish-water-tolerant osteichthyan taxa, and four reptile taxa (two marine and two terrestrial), were also recovered, although they exhibited evidence of extensive taphonomic reworking. The elasmobranch fauna collected from the Dinosaur Park locality is uncommon for vertebrate microfossil assemblages in the Dinosaur Park Formation of Alberta and in equivalent beds in Montana. Seven of the 10 taxa collected from this site [Cretorectolobus olsoni Case, 1978; Eucrossorhinus microcuspidatus Case, 1978; Odontaspis aculeatus (Cappetta and Case, 1975); Archaeolamna kopingensis judithensis Siverson, 1992; Protoplatyrhina renae Case, 1978; Ischyrhiza mira Leidy, 1856; and Ptychotrygon blainensis Case, 1978] are recorded for the first time from the uppermost section of the Judith River Group in Alberta: Carcharias steineri (Case, 1987), represents the first occurrence within the upper Judith River Group from either Alberta or Montana.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 73
Serial Issue: 3
Title: An elasmobranch assemblage from the terrestrial-marine transitional Lethbridge Coal zone (Dinosaur Park Formation; upper Campanian), Alberta, Canada
Affiliation: University of Alberta, Department of Geology and Geophysics, Calgary, AB, Canada
Pages: 494-503
Published: 199905
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 63
Accession Number: 1999-043433
Categories: Vertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch map
N50°42'00" - N50°45'00", W111°45'00" - W111°19'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199915
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