Also known as Pella marls

Where: Keokuk and Mahaska County, Iowa (41.3° N, 92.4° W: paleocoordinates 9.0° S, 32.1° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Pella Formation, Brigantian (336.0 - 326.4 Ma)

• The Pella Fm. overlies the St. Louis Fm. in Iowa.

• formation-level stratigraphic resolution

Environment/lithology: offshore shelf; poorly lithified, burrowed, argillaceous, calcareous wackestone

Collection methods: This list comes from a guidebook.

Primary reference: B. J. Witzke, R. M. McKay, B. J. Bunker and F. J. Woodson. 1990. Stratigraphy and paleoenvironments of Mississippian strata in Keokuk and Washington Counties, southeast Iowa. Iowa Department of Natural Resources, Guidebook Series No. 10 1-105 [A. Miller/A. Webber] more details

PaleoDB collection 3296: authorized by Arnold Miller, entered by Andrew Webber on 29.07.1999, edited by Pete Wagner and Austin Hendy