2½ kilometers north of Thebes: Gamachian, Illinois

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Lyellia thebesensis
Stromatoporoidea - Clathrodictyida - Clathrodictyidae
Clathrodictyon vesiculosum Nicholson and Murie 1878
Anthozoa - Stauriida - Zaphrentidae
Zaphrentis stokesi
synonym of Zaphrenthis
Trilobita - Proetida - Otarionidae
Cyphaspis intermedia
Trilobita - Proetida - Proetidae
Proetus determinatus Foerste 1889
recombined as Thebanaspis determinatus
Trilobita - Lichida - Lichidae
Metapolichas breviceps
original and current combination Lichas (Metopolichas)
Metapolichas breviceps var. clintonensis
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena rhomboidalis (Wahlenberg 1818)
    = Leptaena aequalis Amsden 1974
Amsden 1974
Strophomenata - Orthotetida - Schuchertellidae
Schuchertella propinqua (Meek and Worthen 1868)
Strophomenata - Orthotetida - Triplesiidae
Atrypa tubulistriata Savage 1913
recombined as Cliftonia tubulistriata
Rhynchonellata - Spiriferida - Delthyrididae
Spirifer (Delthyris) sp. (Dalman 1828)
original and current combination Delthyris
Rhynchonellata - Athyridida - Meristellidae
Whitfieldella billingsana (Meek and Worthen 1868)
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rhynchotreta thebesensis Foerste 1909
recombined as Thebesia thebesensis
Rhynchonellata - Pentamerida - Virgianidae
? Clorinda thebesensis Savage 1913
recombined as Brevilamnulella thebesensis
Rhynchonellata - Atrypida - Atrypidae
Atrypa putilla (Hall and Clarke 1894)
Bivalvia - Ostreida - Pterineidae
Pterinea thebesensis
Gastropoda - Murchisoniina - Lophospiridae
Lophospira thebesensis n. sp. Savage 1913
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]