2½ kilometers north of Thebes: Gamachian, Illinois
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Lyellia thebesensis
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Stromatoporoidea
- Clathrodictyida
- Clathrodictyidae
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Clathrodictyon vesiculosum
Nicholson and Murie 1878
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Anthozoa
- Stauriida
- Zaphrentidae
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Zaphrentis stokesi
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synonym of Zaphrenthis | ||||||||||
Trilobita
- Proetida
- Otarionidae
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Cyphaspis intermedia
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Trilobita
- Proetida
- Proetidae
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Proetus determinatus
Foerste 1889
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recombined as Thebanaspis determinatus | ||||||||||
Trilobita
- Lichida
- Lichidae
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Metapolichas breviceps
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original and current combination Lichas (Metopolichas) | ||||||||||
Metapolichas breviceps var. clintonensis | ||||||||||
Strophomenata
- Strophomenida
- Rafinesquinidae
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Leptaena rhomboidalis
(Wahlenberg 1818)
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= Leptaena aequalis
Amsden 1974
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Amsden 1974 | |||||||||
Strophomenata
- Orthotetida
- Schuchertellidae
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Schuchertella propinqua
(Meek and Worthen 1868)
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Strophomenata
- Orthotetida
- Triplesiidae
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Atrypa tubulistriata
Savage 1913
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recombined as Cliftonia tubulistriata | ||||||||||
Rhynchonellata
- Spiriferida
- Delthyrididae
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Spirifer (Delthyris) sp.
(Dalman 1828)
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original and current combination Delthyris | ||||||||||
Rhynchonellata
- Athyridida
- Meristellidae
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Whitfieldella billingsana
(Meek and Worthen 1868)
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Rhynchotreta thebesensis
Foerste 1909
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recombined as Thebesia thebesensis | ||||||||||
Rhynchonellata
- Pentamerida
- Virgianidae
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? Clorinda thebesensis
Savage 1913
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recombined as Brevilamnulella thebesensis | ||||||||||
Rhynchonellata
- Atrypida
- Atrypidae
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Atrypa putilla
(Hall and Clarke 1894)
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Bivalvia
- Ostreida
- Pterineidae
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Pterinea thebesensis
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Gastropoda
- Murchisoniina
- Lophospiridae
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Lophospira thebesensis n. sp.
Savage 1913
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recombined as Paupospira thebesensis | ||||||||||
see common names |
Geography
Country: | United States | State/province: | Illinois | County: | Alexander |
Coordinates: | 37.2° North, 89.5° West (view map) | ||||
Paleocoordinates: | 24.7° South, 62.9° West | ||||
Basis of coordinate: | estimated from map | ||||
Geographic resolution: | local area |
Time
Period: | Ordovician | Epoch: | Late/Upper Ordovician |
10 m.y. bin: | Ordovician 5 | ||
Key time interval: | Gamachian | Graptolite zone: | Normalograptus extraordinarius |
Age range of interval: | 449.50000 - 443.70000 m.y. ago |
Stratigraphy
Formation: | Leemon | ||||
Local section: | North of Thebes | Local bed: | 11.5-15.0 ft | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: Amorphognathus ordovicicus conodont zone
Conochitina scabra chitinozoan zone Top of Normalograptus extraordinarius and Amorphognathus ordovicicus zones. Marks end of HICE |
Lithology and environment
Primary lithology: | ooidal,gray argillaceous "limestone" |
Lithology description: Heavy layer of gray, coarsely granular limestone, oolitic in the upper part, containing many fossils | |
Environment: | carbonate indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Feeding/predation traces: | drill holes |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | biostratigraphic analysis |
Metadata
Database number: | 173289 | ||
Authorizer: | P. Wagner | Enterer: | P. Wagner |
Modifier: | P. Wagner | Research group: | marine invertebrate |
Created: | 2015-09-15 22:27:24 | Last modified: | 2015-09-16 09:55:41 |
Access level: | the public | Released: | 2015-09-15 22:27:24 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
22278. | T. E. Savage. 1913. Stratigraphy and paleontology of the Alexandrian Series in Illinois and Missouri. Part I. Illinois Geological Survey, Bulletin 23:1-124 [G. Webster/G. Webster] |
Secondary references:
187 | T. W. Amsden. 1974. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri. Bulletin - Oklahoma Geological Survey 119:1-154 [J. Alroy/M. Sommers/M. Uhen] |