Where: Medina County, Texas (29.3° N, 99.1° W: paleocoordinates 34.9° N, 72.5° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Bostrychoceras polyplocum ammonoid zone, Anacacho Limestone Formation, Middle Campanian (83.5 - 70.6 Ma)
• AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Bostrychoceras polyplocum zone; was originally entered as Middle Campanian. Comment by J. Sessa: Swezey and Sullivan (2004) correlate this bed to the Baculites maclearni zone., which is middle Campanian in Gradstein et al., 2004. Also, Bostrychoceras polyplocum zone spans almost the entire middle Campanian and part of the upper Campanian, thus I have changed the interval back to middle Campanian.
• bed-level stratigraphic resolution
Environment/lithology: marine; limestone
Size class: mesofossils
Reposited in the USGS
Primary reference: W. P. Elder. 1996. Bivalves and Gastropods from the Middle Campanian Anacacho Limestone, south central Texas. Journal of Paleontology 70(2):247-271 [M. Patzkowsky/K. Layou/J. Alroy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 3607: authorized by Mark Patzkowsky, entered by Karen Layou on 05.08.1999
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Cephalopoda | |
Pachydiscus travisi ammonite | |
cf. Bostrychoceras polyplocum Roemer 1841 ammonite originally entered as "Bostrychoceras cf. polyplocum"
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Baculites taylorensis Adkins 1929 ammonite | |
Gastropoda | |
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Pyropsis aff. proxima Wade 1926 snail "n. sp. aff. proxima" - originally entered as "Pyropsis n. sp. aff. proxima"
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Bivalvia | |
Panopea anacachoensis n. sp.
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Protocardia spillmani cockle | |
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Inoceramus balticus Bohm 1907 clam | |
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Cucullaea sp. Lamarck 1801 clam |