Where: Pueblo County, Colorado (38.3° N, 104.6° W: paleocoordinates 41.3° N, 70.7° W)
• coordinate based on nearby landmark
• basin-level geographic resolution
When: Baculites asper ammonoid zone, Smoky Hill Shale Member (Niobrara Formation), Middle Coniacian (89.3 - 85.8 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: Middle Coniacian, on the basis of inoceramid and ammonite biostratigraphy. STRATIGRAPHIC POSITION: List representative of the the lower limestone 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 87851: authorized by Austin Hendy, entered by Austin Hendy on 26.03.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Neocrioceras sp. ammonite | |
"Phlycticrioceras oregonense" = Phlycticrioceras trinodosus
"Phlycticrioceras oregonense" = Phlycticrioceras trinodosus Geinitz 1850 ammonite | |
Pseudobaculites sp. Cobban 1952 ammonite
Baculites codyensis Reeside 1927 ammonite
Baculites asper Morton 1830 ammonite | |
Bivalvia | |
"Inoceramus (Magadiceramus) subquadratus" = Magadiceramus subquadratus, Inoceramus (Volviceramus) grandis
"Inoceramus (Magadiceramus) subquadratus" = Magadiceramus subquadratus Schlüter 1887 clam |