Also known as Edmontosaurus bonebed, Dragons' Grave, Roxson, HR
Where: Niobrara County, Wyoming (43.5° N, 104.4° W: paleocoordinates 49.9° N, 79.1° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Lance Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)
• bed-level stratigraphic resolution
Environment/lithology: "floodplain"; poorly lithified, gray claystone and lithified, fine-grained, quartzose sandstone
Size classes: macrofossils, mesofossils
• "In the HR Bonebed, skeletal elements are completely disarticulated with three exceptions. In North quarry, three complete Edmontosaurus caudal vertebrae were found articulated as were a femur, tibia, fibula, calcaneum and astragalus. The only other associated bones were two Edmontosaurus tibiae found adjacent to each other in South quarry that appeared to be a paired set. Thus <0.1% of the bones found show actual or possible articulation."
Collected by K. Derstler; SWAU in 1991–1992; 1997–2017
Collection methods: quarrying, surface (in situ), mechanical,
• Eggshells and teeth from Troodon. Bivalves are "freshwater". Originally found by K. Derstler then taken over by crews from Southwestern Adventist University (SWAU).
Primary reference: D. A. Ein. 1992. A dinosaur by any other name. Lapidary Journal 46(8):24-28 [M. Carrano/M. Carrano]more details
Purpose of describing collection: taphonomic analysis
PaleoDB collection 26760: authorized by Matthew Carrano, entered by Matthew Carrano on 29.10.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
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Aves | |
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Reptilia | |
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"Chelonia indet." = Testudines1
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Mammalia | |
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Osteichthyes | |
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Actinopteri | |
Teleostei indet.2 Müller 1846 | |
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Chondrichthyes | |
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Bivalvia | |
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unclassified | |
Plantae indet.1 Haeckel 1866 |