Also known as USGS 13504
Where: Tamaulipas, Mexico (26.3° N, 98.8° W: paleocoordinates 27.4° N, 91.5° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Middle Member (Jackson Formation), Late/Upper Eocene (37.2 - 33.9 Ma)
• The Jackson Group of Mexico and the Gulf Coastal Plain is here considered as a formation. The Jackson Formation can be subdivided into three members, the basal "Roma Sandstone" and middle and upper members (no lithostratigraphic name). No comments are made on relations to Gulf Coastal Plain units, but the enterer considers that the Jackson Formation of this collection is equivalent in age (late Eocene) as the Jackson Group (Gulf Coastal Plain). Collection is from a 10-15 ft lens of fine-grained sandstone or limestone, overlain and underlain by gypsiferous clays and sandy clays.
• bed-level stratigraphic resolution
Environment/lithology: coastal; fine-grained, calcareous sandstone and fine-grained, sandy limestone
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 43057: authorized by Austin Hendy, entered by Austin Hendy on 09.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Nucula spheniopsis" = Nucula (Nucula) sphenopsis
"Nucula spheniopsis" = Nucula (Nucula) sphenopsis Conrad 1865 nut clam | |
Scaphopoda | |
"Cadulus (Polyschides) ? jacksonensis" = Cadulus jacksonensis
"Cadulus (Polyschides) ? jacksonensis" = Cadulus jacksonensis Harris and Palmer 1947 tusk shell | |
Dentalium (Antalis) ? mississippiense Conrad 1848 tusk shell | |
Gastropoda | |
Pseudoliva ? vetusta Conrad 1833 true whelk | |
"Volutospina symmetrica" = Athleta (Volutospina)
"Volutospina symmetrica" = Athleta (Volutospina) volute | |
"Conus (Leptoconus) tortilus" = Conus sauridens
"Conus (Leptoconus) tortilus" = Conus sauridens Conrad 1833 cone shell | |
"Mitra (Fusimitra) millingtoni" = Mitra (Fusimitra) mellingtoni
"Mitra (Fusimitra) millingtoni" = Mitra (Fusimitra) mellingtoni Conrad 1854 mitre shell | |
"Ancillopsis ? subglobosa" = Ancillaria (Ancillopsis)
"Ancillopsis ? subglobosa" = Ancillaria (Ancillopsis) olive snail | |
Calyptraphorus velatus Conrad 1833 snail | |
"Turritella arenicola" = Kapalmerella arenicola
"Turritella arenicola" = Kapalmerella arenicola Conrad 1865 turret shell | |
Volvulella garzai snail | |
Acteocina melinoides barrel-bubble | |
Architectonica josephi, "Architectonica alveata" = Architectonica (Stellaxis) alveatum
Architectonica josephi sundial
"Architectonica alveata" = Architectonica (Stellaxis) alveatum Conrad 1833 sundial |