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Cedar Valley - Shell Rock - Nora, Iowa, USA

GroupCedar Valley
FormationShell Rock
MemberNora
Age:383 - 372 Ma
Late/Upper Devonian
IntervalFrasnian
Lithologylime mudstone/"reef rocks"
Number of Collections10
Number of Occurrences38

Recorded Sample Locations

LocationRegionStratigraphic Name
Brachiopods of Mason City Mbr.Mitchell County, Iowa, USACedar Valley - Shell Rock - Nora
Johnson CountyBenton County, Iowa, USACedar Valley - Shell Rock - Nora

Associated Units

Stratigraphic NameAgeLithologyOccurrence Records
Cedar Valley - Lithograph City - Idlewilde388 - 383 Ma
Devonian		2
Cedar Valley - Lithograph City - Osage Springs388 - 383 Ma
Devonian		limestone/mudstone7
Cedar Valley - Lithograph City - State Quarry383 - 372 Ma
Late/Upper Devonian		grainstone/packstone28
Cedar Valley - Shell Rock - Mason City383 - 372 Ma
Late/Upper Devonian		limestone/grainstone32
Cedar Valley - Shell Rock - Rock Grove383 - 372 Ma
Late/Upper Devonian		limestone/dolomite34

Recorded Fossils

Accepted NameHierarchyAge
Petrocrania sp.
genus		6Animalia : Brachiopoda : Craniata : Craniida : Craniidae : Petrocrania382.7 - 372.2 Ma
Late/Upper Devonian
Athyris sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Athyridida : Athyrididae : Athyris382.7 - 372.2 Ma
Late/Upper Devonian
Pseudoatrypa sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Pseudoatrypa382.7 - 372.2 Ma
Late/Upper Devonian
Pseudoatrypa devoniana
species		7Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Pseudoatrypa : Pseudoatrypa devoniana382.7 - 372.2 Ma
Late/Upper Devonian
Spinatrypina sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Atrypida : Atrypidae : Spinatrypina382.7 - 372.2 Ma
Late/Upper Devonian
Schizophoria sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Orthida : Schizophoriidae : Schizophoria382.7 - 372.2 Ma
Late/Upper Devonian
Sieberella sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Pentamerida : Gypidulidae : Sieberella382.7 - 372.2 Ma
Late/Upper Devonian
Hypothyridina sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Hypothyridinidae : Hypothyridina382.7 - 372.2 Ma
Late/Upper Devonian
Atribonium sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Rhynchonellida : Stenoscismatidae : Atribonium382.7 - 372.2 Ma
Late/Upper Devonian
Allanella sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Adolfiidae : Allanella382.7 - 372.2 Ma
Late/Upper Devonian
Tenticospirifer sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Cyrtospiriferidae : Tenticospirifer382.7 - 372.2 Ma
Late/Upper Devonian
Subcuspidella sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Spinocyrtiidae : Subcuspidella382.7 - 372.2 Ma
Late/Upper Devonian
Spinocyrtia sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Spiriferida : Spinocyrtiidae : Spinocyrtia382.7 - 372.2 Ma
Late/Upper Devonian
Cyrtina sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Spiriferinida : Cyrtinidae : Cyrtina382.7 - 372.2 Ma
Late/Upper Devonian
Cranaena sp.
genus		6Animalia : Brachiopoda : Rhynchonellata : Terebratulida : Cranaenidae : Cranaena382.7 - 372.2 Ma
Late/Upper Devonian
Floweria sp.
genus		6Animalia : Brachiopoda : Strophomenata : Orthotetida : Areostrophiidae : Floweria382.7 - 372.2 Ma
Late/Upper Devonian
Productella sp.
genus		6Animalia : Brachiopoda : Strophomenata : Productida : Productellidae : Productella382.7 - 372.2 Ma
Late/Upper Devonian
Strophalosia sp.
genus		6Animalia : Brachiopoda : Strophomenata : Productida : Strophalosiidae : Strophalosia382.7 - 372.2 Ma
Late/Upper Devonian
Douvillina sp.
genus		6Animalia : Brachiopoda : Strophomenata : Strophomenida : Douvillinidae : Douvillina382.7 - 372.2 Ma
Late/Upper Devonian
Strophodonta (Strophodonta) sp.
subgenus		6.3Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophodontidae : Strophodonta (Strophodonta)382.7 - 372.2 Ma
Late/Upper Devonian
Strophomena (Strophodonta) sp.
subgenus		6.3Animalia : Brachiopoda : Strophomenata : Strophomenida : Strophodontidae : Strophomena (Strophodonta)382.7 - 372.2 Ma
Late/Upper Devonian

References

Day J. (1988) The brachiopod succession of the Late Givetian-Frasnian of Iowa, Devonian of the World, Volume III. Canadian Society of Petroleum Geologists. Calgary, Alberta, Canada, 303-325
Rode A. L., Lieberman B. S. (2004) Using GIS to unlock the interactions between biogeography, environment, and evolution in middle and Late Devonian brachiopods and bivalves, Palaeogeography, Palaeoclimatology, Palaeoecology 211 3-4, 345-359
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
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