ammonites
Catawba Collection 28 (Ordovician of the United States)

Where: Virginia (37.4° N, 80.9° W: paleocoordinates 29.7° S, 61.1° W)

• coordinate based on unpublished field data

• hand sample-level geographic resolution

When: Martinsburg Formation, Mohawkian (457.5 - 452.5 Ma)

• Based on Kreisa (1980, VA Tech Ph.D. dissertation), probably Trenton equivalent

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, gray, calcareous shale and lithified, shelly/skeletal, gray, argillaceous packstone

• Medium gray calcareous shale and medium dark gray argillaceous limestone, laminated to think bedded; thin skeletal packstones and wackestones in upper 300 feet, increasing in thickness and abundance upward

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Size classes: macrofossils, mesofossils

Primary reference: K. M. Layou. 2009. Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States. Palaios 24:118-128 [K. Layou/K. Layou] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 85599: authorized by Karen Layou, entered by Karen Layou on 12.01.2009