Also known as USGS 13587
Where: Tamaulipas, Mexico (24.9° N, 98.2° W: paleocoordinates 25.6° N, 94.3° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Guajalote Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• The Guajalote Formation is early Miocene age and can be correlated with the Tuxpam (or Tuxpan) Formations of southern Mexico, and have also been called San Rafael and San Fernandao Formation (Dumble's nomenclature). The Guajalote Formation has similar faunal composition to the Chipola and Shoal River formations of the Alum Bluff Group, Flordia. Field relations indicate that the fossiliferous beds of the Guajalote Formation lie some 2,500 feet above those of the upper Oligocene.
• bed-level stratigraphic resolution
Environment/lithology: coastal; lithified, shelly/skeletal sandstone
Size class: macrofossils
Preservation: mold/impression
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 43073: authorized by Austin Hendy, entered by Austin Hendy on 10.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Chlamys (Nodipecten) dumblei" = Lyropecten dumblei
"Chlamys (Nodipecten) dumblei" = Lyropecten dumblei Gardner 1945 scallop | |
"Cerastoderma (Dinocardium) ? cabezai" = Dinocardium cabezai
"Cerastoderma (Dinocardium) ? cabezai" = Dinocardium cabezai Gardner 1945 cockle |