Lake Simcoe Area, Ontario, Georgian Bay Formation, Lower Member: Ashgill - Richmondian, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Cymatonata lenior
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Pterobranchia
- Graptoloidea
- Diplograptidae
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Diplograptus foliaceous
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Pterobranchia
- Graptoloidea
- Mastigograptidae
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Mastigograptus gracilimus
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Stenolaemata
- Cystoporata
- Ceramoporidae
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Spatiopora varians
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Stenolaemata
- Trepostomata
- Heterotrypidae
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Stigmatella lambtonensis
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Stigmatella sessilis
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| S. sessilis crassa | ||||||||||
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Leptotrypa expansa
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Stenolaemata
- Trepostomata
- Halloporidae
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Hallopora onealli
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| H. onealli creditensis and H. onealli danforthensis | ||||||||||
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Hallopora dalei
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| H. dalei subalta | ||||||||||
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Rhynchonellata
- Atrypida
- Anazygidae
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Zygospira modesta
(Hall 1847)
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Sowerbyella sericea
(Sowerby 1839)
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| recombined as Sowerbyella (Sowerbyella) sericea | ||||||||||
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina alternata
(Conrad 1838)
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Rafinesquina mucronata
Foerste 1914
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| R. mucronata torontonensis | ||||||||||
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Bivalvia
- Myalinida
- Ambonychiidae
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Byssonychia radiata
(Hall 1847)
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| synonym of Byssonychia radiata | ||||||||||
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Bivalvia
- Modiomorphida
- Modiomorphidae
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Psiloconcha sinuata
Ulrich 1893
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| P. sinuata borealis | ||||||||||
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Whiteavesia pholadiformis
(Hall 1851)
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| recombined as Pholadomorpha pholadiformis | ||||||||||
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Modiolopsis valida
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Modiolopsis ovata
Conrad 1842
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Modiolopsis concentrica
Hall and Whitfield 1875
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Cephalopoda
- Actinocerida
- Actinoceratidae
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Actinoceras crebriseptum
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Trilobita
- Asaphida
- Asaphidae
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Isotelus maximus
Locke 1838
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| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Ontario |
| Coordinates: | 43.7° North, 79.4° West (view map) | ||
| Paleocoordinates: | 24.2° South, 51.9° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | local area |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| 10 m.y. bin: | Ordovician 5 | ||
| *Period: | Late/Upper Ordovician | *Epoch: | Ashgillian | *Local age/stage: | Maysvillian - Richmondian |
| Key time interval: | Ashgill - Richmondian | ||
| Age range of interval: | 449.80000 - 443.80000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Nottawasaga | Formation: | Georgian Bay | Member: | lower |
| Stratigraphic resolution: | member |
Lithology and environment
| Primary lithology: | gray "shale" |
| Includes fossils? | Y |
| Lithology description: Bluish and grey shale with thin interbeds of sandstone, limestone, and dolomite, which are only a few inches thick and rarely more than a foot and not lensitic in character. Many of the sandstones are sub-greywackes; the shale is commonly grey, bluish grey, and greenish grey, weathering buff and yellowish. | |
| Environment: | shallow subtidal indet. |
| Geology comments: Moderately shallow depth. | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 26303 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | J. Alroy | Research group: | marine invertebrate |
| Created: | 2002-10-11 15:36:09 | Last modified: | 2005-02-15 19:59:09 |
| Access level: | the public | Released: | 2002-10-11 15:36:09 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 7251. | B. A. Liberty. 1969. Palaeozoic geology of the Lake Simcoe Area, Ontario. Geological Survey of Canada Memoirs (355)1-201 [S. Holland/T. Hanson/T. Hanson] |