Pentamerid community, Hopkinton Fm.: Llandovery, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Crinoidea - Cyathocrinida - Petalocrinidae
Petalocrinus sp. Weller and Davidson 1896
unclassified
Bryozoa indet. Ehrenberg 1831
Repteporiform
Rhynchonellata - Pentamerida - Pentameridae
Pentameroides indet. Schuchert and Cooper 1931
Rhynchonellata - Pentamerida - Stricklandiidae
Rhynchonellata - Atrypida - Atrypidae
Atrypa sp. Dalman 1828
Ostracoda - Leperditicopida - Leperditiidae
Leperditia sp. Rouault 1851
Anthozoa - Rugosa
Rugosa indet. Milne-Edwards and Haime 1850
rugose coral
Anthozoa - Favositida - Favositidae
Favosites sp. Lamarck 1816
Anthozoa - Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813
see common names

Geography
Country:United States State/province:Iowa County:Jackson
Coordinates: 42.2° North, 90.5° West (view map)
Paleocoordinates:26.7° South, 105.7° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period: Silurian Epoch: Llandovery
10 m.y. bin: Silurian 1
Key time interval: Llandovery Zone:  Cycle V
Age range of interval: 443.8 - 433.4 m.y. ago
Stratigraphy
Formation:Hopkinton Dolomite
Stratigraphy comments: "Early Sil. Llandovery and basal Wenlock. C5"
Lithology and environment
Primary lithology: cherty/siliceous dolomite
Environment:deep subtidal shelf Tectonic setting:cratonic basin
Geology comments: "dolomite, with some nodular chert. less turulent, at or below wave base. BA3. cratonic"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:"Johnson, 1980"
Metadata
Database number:457
Authorizer:A. Miller Enterer:M. Sommers
Modifier:M. Uhen Research group:marine invertebrate
Created:1998-12-10 17:08:30 Last modified:2025-02-22 15:12:02
Access level:the public Released:1998-12-10 17:08:30
Creative Commons license:CC0
Reference information

Primary reference:
61477. M. E. Johnson. 1980. Paleoecological structure in early Silurian platform seas of the North American midcontinent. Palaeogeography, Palaeoclimatology, Palaeoecology 30:191-215 [M. Uhen/M. Uhen/M. Uhen]