Where: Delta County, Michigan (45.9° N, 86.9° W: paleocoordinates 19.5° S, 55.6° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Amorphognathus superbus conodont zone, Bills Creek Formation, Maysvillian to Maysvillian (450.2 - 445.5 Ma)

• Initially given as early Richmondian. Amplexograptus manitoulinensis & Amorphognathus superbus zones according to Wicander & Playford 2008.

• group of beds-level stratigraphic resolution

Environment/lithology: shale

Size class: macrofossils

Reposited in the UMMP

Primary reference: E.C. Stumm and E.G. Kauffman. 1958. Calymenid trilobites from the Ordovician rocks of Michigan. Journal of Paleontology 32(5):943-960 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 75965: authorized by Pete Wagner, entered by Pete Wagner on 07.11.2007

Creative Commons license: CC BY (attribution)