Where: Nuevo Leon, Mexico (26.3° N, 99.5° W: paleocoordinates 31.7° N, 81.2° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Midway Formation, Danian (66.0 - 61.6 Ma)
• The Midway Formation of northeastern Mexico is divided into upper and lower divisions (members). The lower member roughly correlates to the Kincaid and Clayton Formations of the Gulf Coastal Plain. Collection is from a limestone with faunal similarities to the Kincaid Formation.
• bed-level stratigraphic resolution
Environment/lithology: lithified, shelly/skeletal, brown, gray, sandy limestone
Size class: macrofossils
Preservation: original aragonite, original calcite, replaced with calcite
Reposited in the USNM
Collection methods: quarrying,
• Collections reposited in USGS and USNM collections.
Primary reference: J. Gardner. 1945. Mollusca of the Tertiary formations of Northeastern Mexico. Geological Society of American Memoir 11 [M. Kosnik/M. Kosnik/M. Kosnik]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 42895: authorized by Austin Hendy, entered by Austin Hendy on 06.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Hercoglossa cf. vaughani" = Cimomia vaughani
"Hercoglossa cf. vaughani" = Cimomia vaughani Gardner 1923 nautiloid | |
Gastropoda | |
Gyrodes (Sigaretopsis) canrenoides moon snail | |
Pseudoliva nana true whelk | |
Hemisurcula eosilicata turrid | |
Orthosurcula longispersa ribbed mitre | |
"Volutospina (Eoathleta) corvocada" = Athleta (Volutospina)
"Volutospina (Eoathleta) corvocada" = Athleta (Volutospina) volute | |
Bivalvia | |
Ostrea eothirsae oyster | |
Cerastoderma carlotae cockle |