Where: Delta County, Michigan (45.7° N, 86.9° W: paleocoordinates 19.5° S, 55.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Amorphognathus ordovicicus conodont zone, Ogontz Member (Stonington Formation), Richmondian (449.6 - 445.5 Ma)

• Richmond Formation, Stonington beds, Ogontz "member" of beds.

• group of beds-level stratigraphic resolution

Environment/lithology: brown, gray, cherty/siliceous limestone

Size class: macrofossils

Primary reference: R. C. Hussey. 1926. The Richmond Formation of Michigan. In E. S. McCartney (ed.), Michigan University Contributions from the Museum of Geology 2:113-188 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 26315: authorized by Steven Holland, entered by Tori Hanson on 12.10.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)