Also known as Traverse Group, Four Mile Dam Formation - Givetian

Where: Alpena County, Michigan (45.1° N, 83.5° W: paleocoordinates 32.9° S, 28.9° W)

• coordinate based on nearby landmark

When: Polygnathus varcus conodont zone, Dock Street Clay Member (Four Mile Dam Formation), Givetian (388.1 - 383.7 Ma)

Environment/lithology: reef, buildup or bioherm; mudstone

Size class: mesofossils

Primary reference: G. E. O. McIntosh. 2001. Devonian cladid crinoids: families Glossocrinidae Goldring, 1923, and Rutkowskicrinidae new family. Journal of Paleontology 75(4):783-807 [J. Alroy/B. Mamo/B. Mamo] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123245: authorized by John Alroy, entered by Briony Mamo on 16.01.2012

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)