Where: Pueblo County, Colorado (38.3° N, 104.6° W: paleocoordinates 42.5° N, 71.4° W)
• coordinate based on nearby landmark
• basin-level geographic resolution
When: Smoky Hill Shale Member (Niobrara Formation), Santonian (86.3 - 83.6 Ma)
• STRATIGRAPHIC RELATIONS: From the Smoky Hill Shale Mbr of the Niobrara Fm, which regionally overlies the First Hays Limestone and the Carlisle Shale . AGE: Early Campanian, on the basis of inoceramid and ammonite biostratigraphy. STRATIGRAPHIC POSITION: List representative of the the uppermost chalky shale unit of the Smoky Hill Shale.
• group of beds-level stratigraphic resolution
Environment/lithology: deep subtidal shelf; lithified shale
Size class: macrofossils
Preservation: cast, mold/impression
Reposited in the UNSM
Collection methods: surface (in situ), ,
• COLLECTORS: Scott, Cobban, Merewether, and Buckhorn (1984). REPOSITORY: USNM.
Primary reference: G. R. Scott, W. A. Cobban, and E. A. Merewether. 1986. Stratigraphy of the Upper Cretaceous Niobrara Formation in the Raton basin, New Mexico. New Mexico Bureau of Mines and Mineral Resources Bulletin 115:1-34 [A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 87853: authorized by Austin Hendy, entered by Austin Hendy on 26.03.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
Thecostraca | |
Stramentum haworthi Williston 1896 barnacle | |
Cephalopoda | |
Baculites cf. haresi Reeside 1927 ammonite | |
Scaphites cf. hippocrepis DeKay 1828 ammonite
Haresiceras placentiforme ammonite | |
Bivalvia | |
Inoceramus sp., "Inoceramus (Platyceramus) platinus" = Platyceramus platinus
Inoceramus sp. Sowerby 1814 clam
"Inoceramus (Platyceramus) platinus" = Platyceramus platinus Logan 1898 clam | |
Pseudoperna congesta oyster |