Ion Formation Bryozoans of the Upper Mississippi Valley: Rocklandian, Minnesota, Iowa, Wisconsin, Illinois
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Stenolaemata
- Trepostomida
- Monticuliporidae
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Prasopora simulatrix
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Monticulipora grandis
Ulrich 1886
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Homotrypa exilis
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Homotrypa subramosa
Ulrich 1886
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Homotrypa similis
Foord 1883
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Stenolaemata
- Trepostomida
- Atactotoechidae
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Cyphotrypa cf. pachymuralis
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Stenolaemata
- Trepostomida
- Amplexoporidae
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Amplexopora winchelli
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Stenolaemata
- Trepostomida
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Nicholsonella sp.
Ulrich 1890
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Stenolaemata
- Trepostomata
- Trematoporidae
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Batostoma varium
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Batostoma increbescens
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Stenolaemata
- Trepostomata
- Halloporidae
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Diplotrypa sp.
Nicholson 1879
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Stenolaemata
- Trepostomata
- Dittoporidae
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Hemiphragma irrasum
(Ulrich 1893)
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Stenolaemata
- Trepostomata
- Heterotrypidae
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Stigmatella spinosa
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Stigmatella crenulata
Ulrich and Bassler 1906
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Geography
| Country: | United States | State/province: | Minnesota, Iowa, Wisconsin, Illinois |
| Coordinates: | 42.5° North, 91.3° West (view map) | ||
| Paleocoordinates: | 20.6° South, 63.7° 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
| Formation: | Ion |
| Stratigraphic resolution: | formation |
Lithology and environment
| Primary lithology: | argillaceous,calcareous "limestone" |
| Includes fossils? | Y |
| Lithology description: 16 feet thick; calcareous and argillaceous limestone. | |
| Environment: | carbonate indet. |
| Geology comments: Environmental call by T. Hanson. | |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 23378 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2002-07-13 08:44:08 | Last modified: | 2004-10-22 11:42:39 |
| Access level: | the public | Released: | 2002-07-13 08:44:08 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 6692. | O. L. Karklins. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 173-176 [S. Holland/T. Hanson/T. Hanson] |