Kickapoo Shoals, Trinity River (Eocene of the United States)

Also known as M 613

Where: Houston County, Texas (31.3° N, 95.7° W: paleocoordinates 33.3° N, 84.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tyus Member (Weches Formation), 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.

•Zachos: Kickapoo Shoals locality described as ranging from shallow nearshore to intertidal and supratidal environments.

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

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 99070: 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
 Nautilida - Hercoglossidae
Hercoglossa "n. sp. A"
Hercoglossa "n. sp. A" Conrad 1866 nautiloid