Zion South (S7) section, lot 10, Lake Simcoe area: Caradoc, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Phacopida
- Pterygometopidae
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Achatella cf. billingsi
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Trilobita
- Asaphida
- Asaphidae
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Isotelus cf. maximus
Locke 1838
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Isotelus gigas
(Dekay 1824)
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| recombined as Asaphus gigas | ||||||||||
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Gastropoda
- Euomphalina
- Helicotomidae
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Helicotoma sp.
Salter 1859
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Gastropoda
- Bellerophontida
- Sinuitidae
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Sinuites cancellatus
(Hall 1847)
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Gastropoda
- Bellerophontida
- Bucaniidae
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Salpingostoma cf. expansum
(Hall 1847)
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| recombined as Salpingostoma expansa | ||||||||||
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Bucania halli
Ulrich and Scofield 1897
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Gastropoda
- Murchisoniina
- Murchisoniidae
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Hormotoma salteri
Ulrich and Scofield 1897
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| recombined as Cyrtostropha salteri | ||||||||||
| H. salteri canadensis | ||||||||||
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Bivalvia
- Solemyida
- Ctenodontidae
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Ctenodonta nasuta
(Hall 1847)
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Rhynchonellata
- Orthida
- Dalmanellidae
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Paucicrura rogata
(Sardeson 1892)
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Rhynchonellata
- Atrypida
- Anazygidae
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Zygospira recurvirostris
(Hall 1847)
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| recombined as Anazyga recurvirostra | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Rhynchotrematidae
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Rhynchotrema increbescens
(Hall 1847)
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina trentonensis
(Hall 1847)
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Rafinesquina alternata
(Conrad 1838)
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| R. alternata alata and R. alternata intermedia | ||||||||||
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= Rafinesquina alata
Wilson 1944
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Wilson 1946 | |||||||||
| original and current combination Rafinesquina alternata alata | ||||||||||
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Strophomenata
- Strophomenida
- Strophomenidae
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Opikina cf. rugosa
(Wilson 1921)
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Opikina platys
Wilson 1944
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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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Stenolaemata
- Cryptostomata
- Ptilodictyidae
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Stictoporella sp.
Ulrich 1882
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Stenolaemata
- Cryptostomata
- Rhinidictyidae
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Rhinidictya mutabilis
Ulrich 1882
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Stenolaemata
- Trepostomida
- Monticuliporidae
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Prasoporina selwyni
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Prasopora simulatrix
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| P. simulatrix orientalis | ||||||||||
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Stenolaemata
- Trepostomata
- Heterotrypidae
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Dekayella cf. trentonensis
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| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Ontario |
| Coordinates: | 44.4° North, 78.8° West (view map) | ||
| Paleocoordinates: | 25.1° South, 54.9° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| *Period: | Middle Ordovician | *Epoch: | Caradocian | *Local age/stage: | Trentonian |
| Key time interval: | Caradoc | ||
| Age range of interval: | 458.40000 - 449.60000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Lithology and environment
| Primary lithology: | gray "limestone" |
| Secondary lithology: | argillaceous "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: "[B]rownish grey and grey, fine- to coarse-crystalline, bioclastic, crinoidal limestone in beds an inch to 3 inches thick, together with minor amounts of argillaceous limestone and granular fragmental limestone. The strata locally weather grey and brown into beds 8 to 10 inches thick. A peculiar weathering phenomenon, involving a thin, regular, discoidal sheeting effect, oblique to individual beds, and cutting across them, is characteristic and is considered to be crossbedding. On the uppermost surface and visible at only two localities within the map-area, are large ripple-like structures, as much as 30 inches in wave length and 6 inches in amplitude. They are considered to be para-ripples modified by glacial scour action." | |
| Environment: | deep subtidal indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 26274 | ||
| Authorizer: | S. Holland, P. Wagner | Enterer: | T. Hanson, P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2002-10-10 21:13:52 | Last modified: | 2024-03-31 19:20:47 |
| Access level: | the public | Released: | 2002-10-10 21:13:52 |
| 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] |
Secondary references:
| 62157 | A. E. Wilson. 1946. Brachiopoda of the Ottawa Formation of the Ottawa - St. Lawrence Lowland. Geological Survey of Canada Bulletin 8:1-149 [P. Wagner/P. Wagner] |