Where: Colorado (37.7° N, 103.9° W: paleocoordinates 37.4° N, 66.7° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Hartland Shale Member (Greenhorn Limestone Formation), Late/Upper Cenomanian (99.6 - 93.5 Ma)
• Lower one third of the Hartland Shale Member, roughly 4m above the contact with the underlying Lincoln Limestone Member. The calcarenite contains bivalve shells of taxonomically indeterminate inoceramids and the oyster Exogyra aff. E. boveyensis Bergquis , 1944. Exogyra aff. E. boveyensis was initially reported to occur in the middle Late Cenomanian based on the fossil record in Kansas (Hattin, 1975), but Kauffman et al. (1993) depicted the occurrence of this taxon (also referred to as “Exogyra n. sp. aff. E. boveyensis”) as restricted to their Calycoceras cantiaurinum ammonite zone, which is early Late Cenomanian in age. Regardless, the fossiliferous calcarenite bed examined in our study is interpreted to be early Late Cenomanian in age (ca. 94.6 Ma).
• bed-level stratigraphic resolution
Environment/lithology: deep subtidal ramp; lithified limestone
Size classes: macrofossils, mesofossils
Collected by Bruce A. Schumacher in 2006
Collection methods: chemical, acetic,
• Repository: Sternberg Museum of Natural History, Fort Hays State University (FHSM)
Primary reference: M. Nagrodski, K. Shimada, and B. A. Schumacher. 2012. Marine vertebrates from the Hartland Shale (Upper Cretaceous: Upper Cenomanian) in southeastern Colorado, USA. Cretaceous Research 37:76-88 [P. Mannion/P. Mannion/M. Clapham]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 132505: authorized by Philip Mannion, entered by Philip Mannion on 20.08.2012
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Inoceramidae indet. Giebel 1852 clam | |
Exogyra aff. boveyensis oyster | |
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Gnathostomata | |
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Chondrichthyes | |
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"Carcharias saskatchewanensis" = Microcarcharias saskatchewanensis
"Carcharias saskatchewanensis" = Microcarcharias saskatchewanensis Case et al. 1990 sand tiger shark 24 teeth
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Osteichthyes | |
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Reptilia | |
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Actinopteri | |
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