Where: Lyon County, Minnesota (44.5° N, 95.9° W: paleocoordinates 43.9° N, 58.5° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Turonian (93.9 - 89.8 Ma)
• STRATIGRAPHIC RELATIONS: From the Carlise Shale, which regionally overlies the Greenhorn Fm (Turonian), and is overlain by the Niobrara Fm. AGE: Middle-Late Turonian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From 11 m below surface.
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, concretionary, ferruginous claystone
Size class: macrofossils
Preservation: concretion
Collection methods: surface (float),
• COLLECTOR: Unknown. REPOSITORY: UMIP, University of Minnesota.
Primary reference: W. A. Cobban. 1983. Molluscan fossil record from the northeastern part of the Upper Cretaceous seaway, Western Interior. United States Geological Survey Professional Paper 1253:1-25 [A. Hendy/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 88021: authorized by Austin Hendy, entered by Austin Hendy on 30.03.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Proplacenticeras pseudoplacenta" = Placenticeras pseudoplacenta
"Proplacenticeras pseudoplacenta" = Placenticeras pseudoplacenta Hyatt 1903 ammonite |