Michigan, Richmond Formation, Bill's Creek Beds, Haymeadow Creek Section: Ashgill, Michigan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Pterobranchia - Graptoloidea - Diplograptidae
Ostracoda - Podocopida - Bythocyprididae
Ostracoda - Palaeocopida - Euprimitiidae
see common names

Geography
Country:United States State/province:Michigan County:Delta
Coordinates: 46.0° North, 86.9° West (view map)
Paleocoordinates:18.3° South, 110.5° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Ordovician Epoch: Late Ordovician
10 m.y. bin: Ordovician 5
*Period:Late/Upper Ordovician *Epoch:Ashgillian
*Local age/stage:Richmondian
Key time interval: Ashgill
Age range of interval: 449.5 - 443.1 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Richmond
Local section:Haymeadow Creek Local bed:Bill's Creek
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:brown,gray "shale"
Secondary lithology:brown,gray argillaceous "limestone"
Includes fossils?Y
Includes fossils?Y
Lithology description: Shale, thinly-bedded and fissile. Fresh surfaces from light gray to dark chocolate-brown, becoming bluish after weathering. Gray and brown argillaceous limestone.
Geology comments: Tidal flat
Taphonomy
Size of fossils:microfossils
Collection methods and comments
Collection methods:chemical,field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:26306
Authorizer:S. Holland Enterer:T. Hanson
Modifier:J. Alroy Research group:marine invertebrate
Created:2002-10-11 20:55:47 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-10-11 20:55:47
Creative Commons license:CC0
Reference information

Primary reference:
7267. 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]