Where: Catahoula County, Louisiana (31.9° N, 92.0° W: paleocoordinates 32.4° N, 86.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Rosefield Marl Member (Mosley Hill Formation), Late/Upper Oligocene (28.4 - 23.0 Ma)

• "The Rosefield Marl Beds are Oligocene in age (approximately 34 million years old) and correspond to the P19 planktonic foraminiferal zonation."

Environment/lithology: offshore shelf; unlithified, shelly/skeletal marl and brown claystone

Size classes: macrofossils, mesofossils, microfossils

Preservation: original calcite

Collection methods: bulk, surface (in situ), sieve,

• "Bulk and surface sampling were utilized at the type locailty of the Rosefield Marl Beds for this study. Approximately 40kg of sample was collected from the coquina layer (shell bed of early publications) for vertebrated analysis(primarily for fish otoliths). The bulk sample was wet-screened through a 40-mesh sieve and air drid. Microfaunal samples (approximately 1kg) were taken from the coquina layer and a thin clay layer immediately above the coquina. Samples were dried and wet-screened through a 200 mesh screen, heat-dried in an oven then picked for microfauna, including foraminifera, ostracodes, microinvertebrates, and microvertebrates. Systematic surface collections were also utilized at the type locality (the exposure of the coquinia layer is quite limited). Basically all macroscopic remains that were one-half whole or greater were collected."

Primary reference: G. L. Stringer, S. Q. Breard, and M. Kontrovitz. 2001. Biostratigraphy and Paleoecology of Diagnostic Invertebrates and Vertebrates from the Type Locality of the Oligocene Rosefiled Marl Beds, Louisiana. Gulf Coast Association of Geological Societies Transactions LI:321-328 [L. Ivany/P. Wall/P. Wall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 44521: authorized by Linda Ivany, entered by Patrick Wall on 15.09.2004

Creative Commons license: CC BY (attribution)