Weches L2: Marquez, Leon County, TX: Lutetian, Texas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Malacostraca - Decapoda - Callianassidae
4 specimens
Malacostraca - Decapoda - Zanthopsidae
1 specimen
see common names

Geography
Country:United States State/province:Texas County:Leon
Coordinates: 31.2° North, 96.3° West (view map)
Paleocoordinates:36.4° North, 76.8° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Lutetian 10 m.y. bin: Cenozoic 2
Key time interval: Lutetian
Age range of interval: 48.07 - 41.03 m.y. ago
Stratigraphy
Geological group:Claiborne Formation:Weches
Stratigraphic resolution:group of beds
Stratigraphy comments: Original Description: Middle Eocene: Claiborne Group: Mount Selman Formation: Weches Member. (Revised stratigraphy elevates the Weches member to formation in the Lutetian).
Lithology and environment
Primary lithology:concretionary,brown,gray marl
Includes fossils?Y
Lithology description: (The Weches localities are all similar, so a generalized section is provided here). 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).
Environment:marine indet.
Taphonomy
Modes of preservation:body,concretion
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: Other fossils were collected during this investigation, but only crustaceans are presented here.
Metadata
Database number:43138
Authorizer:L. Ivany Enterer:C. Visaggi
Modifier:C. Visaggi Research group:marine invertebrate
Created:2004-08-10 13:37:56 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-08-10 13:37:56
Creative Commons license:CC0
Reference information

Primary reference:
11405.1% 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]