Spechts Ferry Formation, Iowa and Wisconsin: Rocklandian, Iowa/Wisconsin
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Phacopida
- Pterygometopidae
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Eomonorachus intermedius
(Walcott 1879)
|
4 individuals | ||||||
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Trilobita
- Phacopida
- Cheiruridae
|
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Ceraurus plattinensis
|
1 individual | ||||||
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Trilobita
- Asaphida
- Asaphidae
|
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Isotelus gigas
(Dekay 1824)
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5 individuals | ||||||
| recombined as Asaphus gigas | |||||||
|
Isotelus cf. walcotti
Walcott 1918
|
2 individuals | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Iowa/Wisconsin |
| Coordinates: | 42.0° North, 90.0° West (view map) | ||
| Paleocoordinates: | 21.6° South, 63.4° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | basin |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| *Period: | Middle Ordovician - Late/Upper Ordovician | *Local age/stage: | Rocklandian |
| Key time interval: | Rocklandian | ||
| Age range of interval: | 457.00000 - 449.80000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Galena | Formation: | Spechts Ferry |
| Stratigraphic resolution: | formation |
Lithology and environment
| Primary lithology: | argillaceous,silty "limestone" |
| Includes fossils? | Y |
| Environment: | carbonate indet. |
| Geology comments: Lithology and environment taken from Kolata, D. R. "Lithostratigraphy of the Plateville, Galena and Maquoketa Groups in Northern Illinois." Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p. 21-24. R. E. Sloan, ed. | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 23117 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2002-07-09 19:25:27 | Last modified: | 2004-10-22 11:36:03 |
| Access level: | the public | Released: | 2002-07-09 19:25:27 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 6643. | L. L. DeMott. 1987. Platteville and Decorah Trilobites from Illinois and Wisconsin. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 [S. Holland/T. Hanson/S. Holland] |