Also known as USGS 14056
Where: Nuevo Leon, Mexico (25.8° N, 99.2° W: paleocoordinates 26.6° N, 93.1° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Lower marine sandstone Member, Early/Lower Oligocene (33.9 - 28.4 Ma)
• Lower Oligocene age faunas in notheastern Mexico are closely allied to the Chickasawhay and Suwanee limestones of the eastern Gulf Coast. They are recognised in a lower marine sandstone, presumably of lower Oligocene age, and in an upper marine sandstone, presumably of middle Oligocene age. The marine beds are separated by non-maine sediments, typically red and green bentonitic clays. The Oligocene series in Mexico is measured in thousands of feet, although the fauna is only known from a few isolated outcrops.
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified, medium-grained, concretionary, brown, gray, conglomeratic, calcareous sandstone
Size class: macrofossils
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 43077: authorized by Austin Hendy, entered by Austin Hendy on 10.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Conus (Leptoconus) ? protractus cone shell | |
Ficus mississippiensis Conrad 1848 fig shell | |
Sinum mississippiense Conrad 1848 moon snail | |
Bivalvia | |
Pteria sp. Scopoli 1777 pearl oyster | |
Corbula (Caryocorbula) engonata Conrad 1848 clam | |
"Nemocardium ? diversum" = Nemocardium (Nemocardium) diversum, "Cerastoderma (Dinocardium) bakeri" = Dinocardium
"Nemocardium ? diversum" = Nemocardium (Nemocardium) diversum Conrad 1848 cockle
"Cerastoderma (Dinocardium) bakeri" = Dinocardium cockle | |
"Venericardia cf. carsonensis" = Venericardia (Rotundicardia) carsonensis
"Venericardia cf. carsonensis" = Venericardia (Rotundicardia) carsonensis Dall 1903 clam |