Where: Delta County, Michigan (45.9° N, 87.0° W: paleocoordinates 19.3° S, 55.3° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Amorphognathus ordovicicus conodont zone, Ogontz Member (Stonington Formation), Richmondian (449.6 - 445.5 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; 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 26316: authorized by Steven Holland, entered by Tori Hanson on 12.10.2002, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Whiteavesia pholadiformis" = Pholadomorpha pholadiformis
"Whiteavesia pholadiformis" = Pholadomorpha pholadiformis Hall 1851 clam | |
Rhynchonellata | |
"Zygospira recurvirostris" = Anazyga recurvirostra
| |
Platystrophia acutilirata, "Platystrophia clarkesvillensis" = Platystrophia clarksvillensis
Platystrophia acutilirata Conrad 1842
"Platystrophia clarkesvillensis" = Platystrophia clarksvillensis Foerste 1910 | |
Hebertella richmondensis Foerste 1909 | |
| |
Strophomenata | |
"Strophomena neglecta" = Tetraphalerella neglecta, Strophomena parvula
"Strophomena neglecta" = Tetraphalerella neglecta James 1891
Strophomena parvula Foerste 1917 | |
Rafinesquina alternata Conrad 1838 | |
"Plectambonites rugosus" = Sowerbyella rugosa
| |
Anthozoa | |
"Streptelasma rusticum" = Helicelasma rusticum
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral |