Where: Leon County, Texas (31.3° N, 96.0° W: paleocoordinates 33.3° N, 84.9° W)
• coordinate based on political unit
• outcrop-level geographic resolution
When: Weches Formation (Claiborne Group), Lutetian (47.8 - 41.3 Ma)
• Original Description: Middle Eocene: Claiborne Group: Mount Selman Formation: Weches Member. (Revised stratigraphy elevates the Weches member to formation in the Lutetian).
• group of beds-level stratigraphic resolution
Environment/lithology: marine; concretionary, brown, gray marl
•Weches member of Mount Selman formation - g. Red, weathered, glauconitic, fossiliferous marls... 10-20 ft., f. Grey to brown limestone forming large rounded concretions, discontinuous. Corresponds to lentil B of Renick and Stenzel (12, p. 79) in counties further west... 1 ft. e. Layer of Ostrea sellaeformis Conrad and Venericardia planicosta Lamarck... 1 ft. d. Grey to brown, powdery marls with white calcareous nodules, frequently covered with slumped materials... 5 ft. c. Grey, roughly pitted limestone forming prominent benches. Corresponds to lentil A of Renick and Stenzel (12, p.79) in counties further west... 1-2 ft. b. Red-brown, weathered, glauconitic sands and marls with Ostrea sellaeformis Conrad... 1 ft. Queen City member of Mount Selman formation - a. Grey-brown, silty, lignitic shales. (Beds b to d form the basal part of the Weches member, which makes a steep scarp in this region. Zanthopsis peytoni in its typical form is restricted to bed d and occurs in rough nodular lime concretions, the variety parva is restricted to bed g and occurs free. Both forms are common enough to be used as guide fossils for their respective levels).
Size class: macrofossils
Preservation: concretion
Collection methods: Other fossils were collected during this investigation, but only crustaceans are presented here.
Primary reference: H. B. Stenzel. 1934. Decapod Crustaceans from the Middle Eocene of Texas. Journal of Paleontology 8(1):38-56 [L. Ivany/C. Visaggi/C. Visaggi]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 43137: authorized by Linda Ivany, entered by Christy Visaggi on 10.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Malacostraca | |
Zanthopsis peytoni n. sp.
Zanthopsis peytoni n. sp. Stenzel 1934 crab |