Where: Natrona County County, Wyoming (42.7° N, 106.4° W: paleocoordinates 10.3° N, 31.8° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Alcova Limestone Member (Crow Mountain Formation), Spathian (251.3 - 247.2 Ma)
• Alcova (Limestone) Member, Crow Mountain Formation, Chugwater Group
•The stratigraphic correlation and hence determination of the relative geological age of the Alcova Limestone is rendered difficult by the general paucity of fossils, vertebrates (Corosaurus) and invertebrates alike (for a review see Storrs, 1991). The presence of the nothosauriform reptile Corosaurus has led some workers (Colbert, 1957; Zangerl, 1963) to assign the Alcova to the Upper Triassic. Storrs (1 99 1 : 10 1) accepted a late Lower Triassic (Scythian, Spathian) or, perhaps, an early Middle Triassic (Anisian) age for the Alcova Limestone
Environment/lithology: shallow subtidal; lithified, dolomitic, stromatolitic, shelly/skeletal, gray, silty, carbonaceous limestone
Size class: macrofossils
Collected by FIeld Museum in 1948; reposited in the FMNH
Collection methods: surface (in situ),
Primary reference: O. Rieppel. 1998. Corosaurus alcovensis Case and the phylogenetic interrelationships of Triassic stem-group Sauropterygia. Zoological Journal of the Linnean Society 124:1-41 [S. Peters/D. Lovelace]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 138080: authorized by Roger Benson, entered by Roger Benson on 04.01.2013
Creative Commons license: CC BY (attribution)
Taxonomic list
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