Also known as M 440
Where: Alabama (32.0° N, 87.1° W: paleocoordinates 34.9° N, 67.0° W)
• coordinate based on nearby landmark
• hand sample-level geographic resolution
When: McBryde Member (Clayton Formation), Danian (66.0 - 61.6 Ma)
• STRATIGRAPHIC RELATIONS: From the Clayton Fm of the Midway Group. AGE: Early Paleocene. STRATIGRAPHIC POSITION: From the "Nautilus rock" bed (AKA Hercoglossa limesotne) in the Clayton Fm, which belongs to the McBryde Limestone Member.
• bed-level stratigraphic resolution
Environment/lithology: deep subtidal ramp; poorly lithified carbonate
• ENVIRONMENT: Not stated. Schulte & Speijer (2009): The lowered fossil content in the McBryde Limestone Member, as compared to the Turritella Rock (described as a shallow, inner neritic setting), as well as the significantly smaller grain-size of the components, and decreased amounts of coarse silicic detritus, suggest a more distal depositional environment. Open-marine conditions are also indicated by the presence of nautiloids, and more common planktic foraminifera in the marl intervals. In the sandy bioclastic limestones, fossils appear to be reworked from nearshore settings (e.g., algae) and the large grain size of the constituents suggests a high-energy environment, probably above storm wave or even wave base (i.e., <25 m). The condensed claystone intervals around the maximum flooding surfaces may have been deposited below storm wave base, probably in a water depth exceeding 30 m.
• SPECIFIC LITHOLOGY: Unknown, but presumably chalk or marl, given stratigraphic unit. LITHIFICATION: Poorly lithified based on figured specimen.
Size class: macrofossils
Preservation: mold/impression
Collection methods: surface (in situ),
• COLLECTOR: Unknown. REPOSITORY: State University of Iowa.
Primary reference: A. K. Miller and M. L. Thompson. 1933. The nautiloid cephalopods of the Midway Group. Journal of Paleontology 7(3):298-324 [A. Hendy/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 80972: authorized by Austin Hendy, entered by Austin Hendy on 24.05.2008
Creative Commons license: CC BY (attribution)
Taxonomic list
• COVERAGE: Limited to Nautiloidea described in primary publication. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications.
Show authors, comments, and common names
| Cephalopoda |
| Nautilida - Hercoglossidae |
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