ammonites
Martin Marrieta Quarry (Oligocene of the United States)

Where: Craven County, North Carolina (35.1° N, 77.0° W: paleocoordinates 34.9° N, 70.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Lower Member (River Bend Formation), Rupelian (33.9 - 28.4 Ma)

• "entire exposure... measures only a few meters in thickness" and material is from only the lower part of the exposure

• bed-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, brown, sandy wackestone

• light-brown, very slightly sandy biocalcirudite, predominantly micrite with minor amounts of fine to medium, blocky microspar

Preservation: original calcite

Collection methods: upper levels at same quarry yielded barnacles and echinoids that were not described

molds of aragonitic forms were preserved using latex casts

Primary reference: T. J. Rossbach and J. G. Carter. 1991. Molluscan biostratigraphy of the lower River Bend Formation at Martin Marietta Quarry, New Bern, North Carolina. Journal of Paleontology 65(1):80-118 [J. Alroy/J. Alroy/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 4880: authorized by John Alroy, entered by John Alroy on 28.08.1999

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)