ammonites
Dunleith Formation, Eagle Point Member Echinoderms, Upper Mississippi Valley (Ordovician of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W: paleocoordinates 21.3° S, 63.6° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Eagle Point Member (Dunleith Formation), Shermanian (460.9 - 449.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: dolomitic limestone

• Environmental call by T. Hanson.
• Slightly dolomitic limestone. Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. Edited by R. E. Sloan.

Size class: macrofossils

Primary reference: D. R. Kolata, J. C. Brower, and T. J. Frest. 1987. Upper Mississippi Valley Champlainian and Cincinnatian echinoderms. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 179-181 [S. Holland/T. Hanson/T. Hanson] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23470: authorized by Steven Holland, entered by Tori Hanson on 15.07.2002