Chacon Creek, Laredo (Eocene of the United States)
Also known as M 616
Where: Webb County, Texas (27.5° N, 99.5° W: paleocoordinates 29.0° N, 91.1° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Cook Mountain Formation (Claiborne Group), Bartonian (41.3 - 38.0 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: shoreface; concretionary, glauconitic sandstone
• Cross-bedded units suggest shoreface environment.
• From a yellow calcareous septarian concretion. The Cook Mountain on Arroyo Chacon was described as predominantly cross-bedded greenstone by Trowbridge (1932).
Size class: mesofossils
Primary reference: A. K. Miller. 1947. Tertiary nautiloids of the Americas. Geological Society of America Memoir 23:1-234 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 99061: authorized by Jocelyn Sessa, entered by Ursula Smith on 26.10.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
| Cephalopoda | |
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cf. Aturia brazoensis Stenzel 1935 nautiloid | |