Diamphidiocystis drepanon-Savagella Comm., Orchard Creek Shale, Scales Fm.: Richmondian, Illinois
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa
- Stauriida
- Streptelasmatidae
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Salvadorea randi
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Edrioasteroidea
- Isorophidae
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? Isorophus sp.
Foerste 1916
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Edrioasteroidea
- Pyrgocystidae
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? Pyrgocystis sp.
Bather 1915
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Edrioasteroidea
- Isorophida
- Agelacrinitidae
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Savagella sp.
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Hystrichopsydrax sp.
Guensburg 1988
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Edrioasteroidea
- Isorophida
- Lebetodiscidae
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Euhydrodiskos sp.
Guensburg 1988
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Rhombifera
- Callocystitidae
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Lepadocystis sp.
Carpenter 1891
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Crinoidea
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Crinoidea indet.
Miller 1821
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Stylophora
- Mitrata
- Anomalocystitidae
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Enoploura sp.
Wetherby 1879
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Stylophora
- Mitrata
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Diamphidiocystis drepanon
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Tentaculitida
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Tentaculitida indet.
Ljaschenko 1955
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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Rhynchonellata
- Orthida
- Dalmanellidae
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Paucicrura sp.
Cooper 1956
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina sp.
Hall and Clarke 1892
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Bivalvia
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Pelecypoda indet.
Goldfuss 1820
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synonym of Bivalvia | |||||||
Gastropoda
- Bellerophontida
- Bucaniidae
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Phragmolites sp.
Conrad 1838
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Trilobita
- Asaphida
- Asaphidae
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Isotelus sp.
Dekay 1824
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Trilobita
- Corynexochida
- Illaenidae
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Bumastus sp.
Murchison 1839
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see common names |
Geography
Country: | United States | State/province: | Illinois |
Coordinates: | 37.2° North, 89.5° West (view map) | ||
Paleocoordinates: | 24.7° South, 62.9° West | ||
Basis of coordinate: | based on political unit | ||
Geographic resolution: | local area |
Time
Period: | Ordovician | Epoch: | Late/Upper Ordovician |
Stage: | Katian | 10 m.y. bin: | Ordovician 5 | *Epoch: | Ashgill | *Local age/stage: | Richmondian |
Key time interval: | Richmondian | ||
Age range of interval: | 449.80000 - 446.00000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Geological group: | Maquoketa | Formation: | Scales | Member: | Orchard Creek Shale |
Stratigraphic resolution: | member | ||||
Stratigraphy comments: "Richmondian of current Illinois usage" 1-3 m above contact with Thebes Sst. |
Lithology and environment
Primary lithology: | burrows,bioturbation silty,calcareous "shale" | ||
Secondary lithology: | burrows,bioturbation argillaceous "limestone" | ||
Includes fossils? | Y | ||
Includes fossils? | Y | ||
Lithology description: "At te single known locality scattered shelly fossils are sparsely distributed in calcareous silty shales and hard argillaceous limestones...grazing trails, burrows, and burrow mottling...most fossils except trilobites are whole..." | |||
Environment: | deep subtidal indet. | Tectonic setting: | cratonic basin |
Geology comments: "Guesburg (1988) interprets theunit as a low-energy environment with a rapid rate of depostion and occasional moderate wave or current activity. He facored a shallow subtidal position, but the rate of depostion and comparison with better known communities from rocks of similar age and environment (e.g. other Maquoketa Group communities) suggest a more offshore position, perhaps corresponding with an outer BA 3 to well into 4, somewhat restricted Silurian assemblage." This community is grouped by authors with others having a deeper shelf environment relative to the shoal margin communities.
SEP environmental call based on given information and regional context |
Taphonomy
Collection methods and comments
Reason for describing collection: | paleoecologic analysis |
Collection method comments: Some overlap with PBDB collections 23235-6, 23521-2, 23682, 23684, 23783-4, and 23810-11, but not a duplicate entry. |
Metadata
Database number: | 26684 | ||
Authorizer: | M. Foote | Enterer: | M. Foote |
Modifier: | S. Peters | Research group: | marine invertebrate |
Created: | 2002-10-24 05:01:48 | Last modified: | 2003-05-04 12:41:01 |
Access level: | the public | Released: | 2002-10-24 05:01:48 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
4379. | T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner] |