Also known as USGS 13505
Where: Tamaulipas, Mexico (26.3° N, 98.8° W: paleocoordinates 27.0° N, 92.7° 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
Preservation: concretion
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 43064: authorized by Austin Hendy, entered by Austin Hendy on 10.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Chione (? Chamelea) matutina" = Chamelea, "Macrocallista (Chionella) cantui" = Pitar (Chionella)
"Chione (? Chamelea) matutina" = Chamelea venus clam
"Macrocallista (Chionella) cantui" = Pitar (Chionella) venus clam | |
Corbula (Caryocorbula) engonata Conrad 1848 clam | |
Gastropoda | |
| |
Terebra (Strioterebrum) ? tantula Conrad 1890 auger snail | |
Conus (? Leptoconus) ? protractus cone shell | |
Ficus mississippiensis Conrad 1848 fig shell | |
Scaphopoda | |
Dentalium (Antalis) mississippiense Conrad 1848 tusk shell |