Basal Maquoketa fm., basal Richmondian: Richmondian, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Lingulata - Lingulida - Obolidae
Leptobolus sp. Hall 1871
Hyolithida - Hyolithidae
Polyplacophora
Tergomya - Cyrtonellida - Cyrtolitidae
Gastropoda - Bellerophontida
Wagner 2023
unclassified
Gastropoda - Bellerophontida - Tropidodiscidae
Gastropoda - Euomphalina - Platyceratidae
Gastropoda - Euomphalina - Holopeidae
Gastropoda - Murchisoniina - Hormotomidae
originally Murchisonia; PJW3
Gastropoda - Murchisoniina - Lophospiridae
originally Loxoplocus; PJW3
Gastropoda - Murchisoniina - Eotomariidae
Bivalvia - Modiomorphida - Modiomorphidae
Orthodesma sp. Hall and Whitfield 1875
Bivalvia - Nuculanida - Malletiidae
Bivalvia - Nuculanida - Cucullellidae
Bivalvia - Nuculida - Praenuculidae
originally entered as "? Praenucula sp."
Palaeoconcha sp. Miller 1889
Cephalopoda - Orthocerida - Orthoceratidae
Michelinoceras sp. Foerste 1932
Scaphopoda - Dentaliida - Dentaliidae
originally entered as "? Plagioglypta sp."
see common names

Geography
Country:United States State/province:Iowa
Coordinates: 42.0° North, 91.6° West (view map)
Paleocoordinates:20.0° South, 115.7° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:basin
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 Member:basal
Stratigraphy comments: "U. Ord. basal Richmondian, basal Maquoketa (above unconformity)"
Lithology and environment
Primary lithology:phosphatic silty dolomite
Environment:shallow subtidal indet. Tectonic setting:cratonic basin
Geology comments: "clayey and silty dolomite with phosphate, broad shallow epeiric sea, fluctuating salinity and O2. BA1 probably flooding s[illeg.]-deep BA5-6. craton."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Taxonomic list comments:W.B. Harrison III and L.K. Harrison, 1975. A Maquoketa-like molluscan community in the Brassfield Fm. (early Silurian) of Adams Co., OH. Bull. Amer. Paleo. 67:193-23[illeg.] P.W. Bretsky and J.J. Bermingham, 1970. Ecology off the Paleozoic scaphopo[illeg.] gn. Plagioglypta with special reference to the Ord of eastern Iowa. J. Paleo. 44:908-924. Yochelson 1978 argues Plagioglypta (?) is Coleolus (= ? polychaeta)"
Metadata
Database number:356
Authorizer:J. Sepkoski, P. Wagner Enterer:M. Sommers, P. Wagner
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:
61105. P. W. Bretsky and J. J. Bermingham. 1970. Ecology of the Paleozoic scaphopod genera Plagioglypta with special reference to the Ordovician of eastern Iowa. Journal of Paleontology 44:908-924 [M. Uhen/J. Ju/M. Uhen]

Secondary references:

11633 W. B. Harrison and L. K. Harrison. 1975. A Maquoketa-like molluscan community in the Brassfield Formation (Early Silurian) of Adams County, Ohio. Bulletins of American Paleontology 67:193-234 [P. Wagner/P. Wagner/J. Ju]
15211 R. D. Lewis and E. L. Yochelson. 1978. Palliseria robusta Wilson (Gastropoda) in Oil Creek Formation, Arbuckle Mountains, Oklahoma. Oklahoma Geology Notes 38(2):43-48 [P. Wagner/P. Wagner]
9042 P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]