Michigan, Richmond Formation Big Hill Beds, Hinkin's Hill: Ashgill, Michigan
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Anthozoa
- Favositida
- Favositidae
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Anthozoa
- Lichenariida
- Lyoporidae
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Lyopora goldfussi
(Billings 1858)
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Anthozoa
- Sarcinulida
- Syringophyllidae
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Calapoecia cribriformis
(Nicholson 1874)
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Anthozoa
- Heliolitida
- Halysitidae
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Halysites gracilis
Hall in Foster and Whitney 1851
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Anthozoa
- Stauriida
- Streptelasmatidae
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Streptelasma rusticum
(Billings 1858)
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Streptelasma divaricans
(Nicholson 1875)
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Anthozoa
- Stauriida
- Disphyllidae
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Columnaria alveolata
Goldfuss 1826
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Stromatoporoidea
- Labechiida
- Aulaceratidae
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| [entered as Beatricea nodilifera] | ||||||||||
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? Beatricea sp.
Billings 1857
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Rhynchonellata
- Rhynchonellida
- Rhynchotrematidae
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Rhynchotrema perlamellosum
Whitfield 1882
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Michigan | County: | Delta |
| Coordinates: | 45.8° North, 86.8° West (view map) | ||||
| Paleocoordinates: | 18.6° 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: | Late/Upper Richmondian |
| Key time interval: | Ashgill | ||
| Age range of interval: | 449.5 - 443.1 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Richmond | Local bed: | Big Hill |
| Stratigraphic resolution: | group of beds |
Lithology and environment
| Primary lithology: | brown,gray argillaceous,cherty/siliceous "limestone" |
| Includes fossils? | Y |
| Lithology description: Argillaceous limestone, soft to hard, considerable siliceous material irregularly distributed throughoout. Common greenish inclusions. Light gray to brown. | |
| Environment: | carbonate indet. |
| Geology comments: Environmental call by T. Hanson. | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 26331 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | J. Alroy | Research group: | marine invertebrate |
| Created: | 2002-10-13 11:12:47 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2002-10-13 11:12:47 |
| 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] |