Thaerodonta-Cupulocrinus angustus-Cornulites Community of the Brainard: Richmondian, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Porifera indet. Grant 1836
Demospongiae - Streptosclerophorida - Hindiidae
Trilobita - Phacopida - Calymenidae
Trilobita - Phacopida - Cheiruridae
Ceraurus sp. Green 1832
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Rhynchonellata - Atrypida - Anazygidae
Rhynchonellata - Orthida - Dalmanellidae
Strophomenata - Strophomenida - Sowerbyellidae
Strophomenata - Strophomenida - Furcitellidae
Strophomenata - Strophomenida - Strophomenidae
Tetraphalerella planodorsata (Winchell and Schuchert 1892)
unclassified
Bryozoa indet. Ehrenberg 1831
Tentaculitida - Cornulitidae
Cornulites sp. Schlotheim 1820
Gastropoda
Gastropoda - Euomphalina - Platyceratidae
Gastropoda - Murchisoniina - Murchisoniidae
Murchisonia (Hormotoma) sp.
Wagner 2023
Gastropoda - Murchisoniina - Lophospiridae
Loxoplocus (Lophospira) sp.
Lenz 1977
Lophospira, Eunema or Paupospira
Bivalvia - Nuculanida - Malletiidae
Bivalvia - Nuculanida - Cucullellidae
unclassified
Crinoidea
Crinoidea indet. Miller 1821
unidentified crinoid stems
Crinoidea - Cupulocrinidae
Cupulocrinus sp. nov. cf. angustatus
Crinoidea - Plicodendrocrinidae
Crinoidea - Porocrinida
see common names

Geography
Country:United States State/province:Iowa County:Dubuque County
Coordinates: 42.9° North, 91.7° West (view map)
Paleocoordinates:19.2° South, 115.2° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:outcrop
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
*Period:Late/Upper Ordovician *Epoch:Ashgill
*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 Member:Brainard
Stratigraphy comments: top 2.5 m of Brainard from contact with the Silurian
Lithology and environment
Primary lithology:bioturbation,dolomitic lithified silty,calcareous "shale"
Secondary lithology:dolomitic,ferruginous lithified wackestone
Includes fossils?Y
Lithology description: The upper Brainard sections most likely to have this community consist of silty calcareous or dolomitic biotutbated shales with interbedded brachiopod-bryozoan-echinoderm ferruginous dolowackestones and some packstones... Occasional phosphatic or highly pyritic intervals with either phosphatized diminutive or normal-sized mollusc faunas occur sporadically throughout the outcrop area.
Environment:offshore indet.
Geology comments: The variable lithology but generally intact fossil preservation in the carbonate intervals suggests a moderately offshore environment still subject, however, to at least occasional storm disturbances. A BA 3-4 position seems likely.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:13260
Authorizer:M. Foote, P. Wagner Enterer:K. Koverman, P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-02-04 08:53:30 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-02-04 08:53:30
Creative Commons license:CC0
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]

Secondary references:

7341 A. C. Lenz. 1977. Upper Silurian and Lower Devonian brachiopods of Royal Creek, Yukon Canada. Part 1. Orthoida, Strophomenida, Pentamerida, Rhynchonellida. Palaeontographica Abteilung A 159(1-3):37-109 [M. Foote/M. Foote/M. Foote]
9042 P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]