Isotelus-Diplograptus community, Maquoketa Fm.: Richmondian, Minnesota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Hexactinellida
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Hexactinellida indet.
Schmidt 1870
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| hexactinellid spicules | ||||||||||
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Trilobita
- Phacopida
- Pterygometopidae
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Pterygometopus cf. sclerops
(Dalman 1827)
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| originally entered as "Pterygometopus cf. sclerops" | ||||||||||
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Trilobita
- Phacopida
- Cheiruridae
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Ceraurus pleurexanthemus
Green 1832
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| originally entered as Ceraurus pleurexanthomus | ||||||||||
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Trilobita
- Asaphida
- Asaphidae
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Isotelus cf. gigas
(Dekay 1824)
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| originally entered as "Isotelus cf. gigas" | ||||||||||
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Trilobita
- Lichida
- Lichidae
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Amphilichas cf. cucullus
(Meek and Worthen 1865)
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| originally entered as "Amphilichas cf. cucullus" | ||||||||||
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Cephalopoda
- Pseudorthocerida
- Spyroceratidae
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| originally entered as "Spyroceras cf. perroti" | ||||||||||
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Conodonta
- Prioniodontida
- Oistodontidae
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Conodonta
- Panderodontida
- Panderodontidae
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Conodonta
- Ozarkodinida
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Conodonta
- Proconodontida
- Cordylodontidae
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| originally entered as "Corylodus delicatus" | ||||||||||
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unclassified
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Pterobranchia
- Graptoloidea
- Diplograptidae
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Diplograptus peosta
Hall 1861
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Pterobranchia
- Dendroidea
- Dendrograptidae
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Desmograptus cancellatus
(Hopkinson 1875)
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Minnesota |
| Coordinates: | 43.6° North, 92.4° West (view map) | ||
| Paleocoordinates: | 18.3° South, 115.3° West (Wright 2013) | ||
| Basis of coordinate: | based on political unit |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| Stage: | Katian | 10 m.y. bin: | Ordovician 5 |
| *Period: | Late/Upper Ordovician | *Local age/stage: | Richmondian |
| Key time interval: | Richmondian | ||
| Age range of interval: | 449.6 - 445.5 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Maquoketa | ||||
| Stratigraphy comments: "U. Ord.- Richmondian" |
Lithology and environment
| Primary lithology: | "limestone" |
| Secondary lithology: | "shale" |
| Environment: | marine indet. |
| Geology comments: "nodular sh and ls (dark); no shelled benthos (BA6)" | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
| Taxonomic list comments:"T. Bayer, 1965. The Maquoketa Fm. in Minnesota and an analysis of it's benthonic communities. Ph. D. diss. UMN 209p." | |
Metadata
| Database number: | 358 | ||
| Authorizer: | J. Sepkoski | Enterer: | M. Sommers |
| Modifier: | J. Ju | Research group: | marine invertebrate |
| Created: | 1998-11-20 10:07:18 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 1998-11-20 10:07:18 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 61178. | T. Bayer. 1965. The Maquoketa Formation in Minnesota and an analysis of its benthonic communities. 1-209 [M. Uhen/J. Ju/M. Uhen] |