Palaeoneilo fecunda-Plagioglypta iowaensis Community of the Dubuque: Maysvillian, Iowa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Plagioglypta iowaensis
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Scolecodonta indet.
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Scyphozoa
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Climacoconus pumilus
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Demospongiae
- Streptosclerophorida
- Hindiidae
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Hindia ? parva
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Conodonta
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Conodonta indet.
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Pterobranchia
- Graptoloidea
- Diplograptidae
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Orthograptus truncatus
(Lapworth 1876)
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| recombined as Rectograptus truncatus | ||||||||||
| Orthograptus truncatus peosta | ||||||||||
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Crinoidea
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Crinoidea indet.
Miller 1821
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| undetermined crinoid plates | ||||||||||
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Polyplacophora
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Septemchiton iowaensis
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Gastropoda
- Murchisoniina
- Lophospiridae
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Loxoplocus (Lophospira) depauperata
(Hall and Whitney 1862)
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| nomen vanum belonging to Lophospira | ||||||||||
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Gastropoda
- Murchisoniina
- Eotomariidae
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Liospira micula
(Hall and Whitney 1862)
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Gastropoda
- Bellerophontida
- Bellerophontidae
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Bucanopsis lirata
(Ladd 1925)
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Bucanopsis patersoni
(Hall 1862)
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| original and current combination Bellerophon patersoni | ||||||||||
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Gastropoda
- Bellerophontida
- Bucanellidae
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Bucanella (Bucanella) conradi
(Hall 1862)
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Gastropoda
- Euomphalina
- Platyceratidae
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Cyclora minuta
Hall 1845
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| recombined as Cyclonema minuta | ||||||||||
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Bivalvia
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Bivalvia indet.
Linnaeus 1758
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Bivalvia
- Solemyida
- Ctenodontidae
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Ctenodonta anatina
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Bivalvia
- Nuculida
- Praenuculidae
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Similodonta obliqua
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Bivalvia
- Nuculanida
- Cucullellidae
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Nuculites neglectus
(Hall 1862)
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Bivalvia
- Nuculanida
- Malletiidae
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Palaeoneilo fecunda
(Hall 1862)
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Cephalopoda
- Orthocerida
- Proteoceratidae
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Isorthoceras sociale
(Hall in Miller 1877)
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Hyolithida
- Hyolithidae
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Hyolithes parviusculus
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Rhynchonellata
- Orthida
- Platyorthidae
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Diceromyonia sp.
Wang 1949
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Lingulata
- Lingulida
- Lingulasmatidae
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Lingula changi
Hussey 1928
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| recombined as Lingulasma changi | ||||||||||
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Lingulata
- Lingulida
- Obolidae
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Leptobolus occidentalis
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Lingulata
- Acrotretida
- Acrotretidae
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Conotreta sp.
Walcott 1889
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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Trilobita
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Trilobita indet.
Walch 1771
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Ostracoda
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Ostracoda indet.
Latreille 1802
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Iowa | County: | Dubuque County |
| Coordinates: | 42.5° North, 90.9° West (view map) | ||||
| Paleocoordinates: | 20.5° South, 61.6° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| Stage: | Katian | 10 m.y. bin: | Ordovician 5 |
| *Period: | Late/Upper Ordovician | *Epoch: | Early/Lower Ashgill | *Local age/stage: | Maysvillian |
| Key time interval: | Maysvillian | ||
| Age range of interval: | 450.40000 - 449.80000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Scales | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Scales Formation, basal 3 cm phosphorite just above the contact with the Dubuque Formation and below the Argo-Fay Bed of Kolata & Graese (1983). | |||||
Lithology and environment
| Primary lithology: | lithified phosphorite |
| Lithology description: Richly fossiliferous. The lithology is a 1-100cm thick poorly sorted, poorly consolidated phosporite composed of concentrically laminated hydroxyapatite pellets less than 1 mm in diameter, irregularly shaped apatite clasts ranging up to pebble size, and phosphatized fossils. The Dubuque surface, most likely a submarine corrosion surface much like those typical of the underlying Galena Group, may have as much as 8 cm of relief (Witzke, 1985b) and is commonly phosphate and/or pyrite coated and bored. No epifauna has been observed attached to it. The phosphorite commonly contains quartz geodes with minor sulfide mineralization and more common calcite, fluorite, dolomite, and selenite crystals. The matrix may be more or less completely pyritized or limonized, but the unit is as often essentially unlithified. | |
| Environment: | deep subtidal shelf |
Taphonomy
| Modes of preservation: | body,replaced with phosphate |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 13262 | ||
| Authorizer: | M. Foote | Enterer: | K. Koverman |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2002-02-04 10:54:53 | Last modified: | 2006-07-23 00:41:17 |
| Access level: | the public | Released: | 2002-02-04 10:54:53 |
| 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] |