Roadcut near Turkey Creek on south side of county highway east of Fort Atkinson: Richmondian, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Maquoketacrinus ornatus
Rhombifera - Pleurocystitidae
Pleurocystites spp.
Pleurocystites beckeri Foerste 1924
Soluta - Syringocrinida - Iowacystidae
Iowacystis sagittaria
Crinoidea - Diplobathrida - Rhodocrinitidae
Archaeocrinus obconicus
? Trichinocrinus sp. Moore and Laudon 1943
Crinoidea - Cupulocrinidae
Cupulocrinus aff. latibrachiatus (Billings 1857)
original and current combination Dendrocrinus latibrachiatus
Crinoidea - Taxocrinida - Taxocrinidae
Protaxocrinus sp. Springer 1906
Crinoidea - Porocrinida
Carabocrinus slocomi
Porocrinus fayettensis
Crinoidea - Dendrocrinida - Dendrocrinidae
? Dendrocrinus oswegoensis
Crinoidea - Calceocrinida - Calceocrinidae
Calceocrinus levorsoni
Crinoidea - Myelodactylida - Iocrinidae
Iocrinus sp. Hall 1866
Crinoidea - Homocrinida - Homocrinidae
Ectenocrinus raymondi
Sygcaulocrinus typus Ulrich 1925
Asteroidea - Hadrosida - Hudsonasteridae
Hudsonaster sp. Stürtz 1899
Echinoidea - Bothriocidaroida - Bothriocidaridae
Bothriocidaris maquoketensis
Cyclocystoidea - Cyclocystoididae
Cyclocystoides sp. Salter and Billings 1858
Edrioasteroidea - Edrioblastoida - Steganoblastidae
Astrocystites aff. ottawaensis
see common names

Geography
Country:United States State/province:Iowa County:Winneshiek
Coordinates: 43.1° North, 91.9° West (view map)
Paleocoordinates:19.1° South, 60.0° 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:Ashgill
*Local age/stage:Early/Lower Richmondian - Maysvillian
Key time interval:Richmondian
Age range of interval:449.80000 - 446.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Maquoketa Formation:Fort Atkinson Member:Upper
Stratigraphic resolution:group of beds
Stratigraphy comments: upper Fort Atkinson Formation
Lithology and environment
Primary lithology:grading lithified cherty/siliceous grainstone
Lithology description: Very fossiliferous, but whole fossils uncommon. The most common lithology is echinodermal grainstone and packstone in thin, somewhat rubbly beds to 3.7 cm in thickness. Locally there are interbedded chert lenses, some graded bedding, and winnowed debris piles.
Environment:shallow subtidal indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Also known as:Porocrinus fayettensis-Pleurocystites beckeri-Sygcaulocrinus typus Community at
Database number:13200
Authorizer:M. Foote Enterer:K. Koverman
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-01-29 08:30:45 Last modified:2018-10-25 14:47:54
Access level:the public Released:2002-01-29 08:30:45
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]