North ditch of Robbins-Centerville road (Eocene of the United States)

Also known as BEG 145-T-1

Where: Leon County, Texas (31.3° N, 96.1° W: paleocoordinates 33.3° N, 85.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Weches Formation (Claiborne Group), Lutetian (47.8 - 41.3 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; poorly lithified, glauconitic, muddy sandstone

• Choung, 1975: Should the bathymetry be inferred strictly on the basis of [foraminiferal] species diversity and dominance, the average Weches environment has never been deeper than 10 fathoms. (This is approximately the maximum depth (20 +/- m) of the inner neritic zone as defined in the present study.) The relative percentage of planktonic species also suggests that the Weches Formation was mostly under inner neritic conditions (planktonic/ total population ratio = less than 5%) except in the middle portion of the section, where, for a brief period of time, up to 13% of the planktonic population observed indicates a period of middle neritic deposition (at least on the basis of planktonic foraminifers).

•Ramos & Galloway: Weches Formation consists of shelf sands and muds that overlie a transgressive ravinement surface eroded into underlying coastal/deltaic facies.

•Appears to represent lower part of shoreface or possibly upper part of offshore transition.

Size class: macrofossils

Preservation: mold/impression

Collected by Stenzel; reposited in the TMM

• Repository: Bureau of Economic Geology, Austin, Texas

Primary reference: H. B. Stenzel. 1935. Nautiloids of the genus Aturia from the Eocene of Texas and Alabama. Journal of Paleontology 9:551-562 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 180310: authorized by Matthew Clapham, entered by Matthew Clapham on 13.07.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Nautilida - Aturiidae
Aturia (Brazaturia) triangula