Where: Wyoming (42.6° N, 106.3° 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 (1991:101) 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 in 1983; reposited in the YPM
Collection methods: surface (float),
• Most of the Yale Peabody Museum specimens were discovered in talus blocks beneath cliffs of the horizontal Alcova Limestone
Primary reference: G. W. Storrs. 1991. Anatomy and relationships of Corosaurus alcovensis (Diapsida: Sauropterygia) and the Triassic Alcova Limestone of Wyoming. Bulletin of the Peabody Museum of Natural History 44:1-151 [R. Benson/R. Benson]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 138081: authorized by Roger Benson, entered by Roger Benson on 04.01.2013
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
Corosaurus alcovensis Case 1936 diapsid |