Where: Houghton County, Michigan (46.8° N, 88.7° W: paleocoordinates 17.9° S, 55.7° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Amplexograptus manitoulinensis graptolite zone, Bills Creek Formation, Richmondian (449.6 - 445.5 Ma)

• Richmond Layer VI in original paper. early Richmondian; terminology of Case & Robinson (1915); probably equivalent to Bills Creek.

• 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 75967: authorized by Pete Wagner, entered by Pete Wagner on 07.11.2007

Creative Commons license: CC BY (attribution)