Rockford (Ager) (Devonian of the United States)

Where: Floyd County, Iowa (43.1° N, 93.0° W: paleocoordinates 29.2° S, 37.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cerro Gordo Member (Lime Creek Formation), Frasnian (382.7 - 372.2 Ma)

• several beds in the middle of the member

• group of beds-level stratigraphic resolution

Environment/lithology: marine; calcareous shale

• paleoenvironment not discussed

Collection methods: field collection of Ager

Primary reference: P. Wallace. 1978. Homeomorphy between Devonian brachiopod communities in France and Iowa. Lethaia 11:259-272 [J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 3403: authorized by John Alroy, entered by John Alroy on 31.07.1999, edited by Alycia Stigall and Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• total number of specimens 516
unclassified
  -
Strophomenata
 Productida - Productellidae
Productella rugatula1 Stainbrook 1945
Productella thomasi1 Stainbrook 1945
 Productida - Monticuliferidae
 Orthotetida - Schuchertellidae
 Strophomenida - Douvillinidae
 Strophomenida - Strophodontidae
"Strophodonta thomasi" = Strophomena (Strophodonta), "Strophodonta biplacata" = Strophomena (Strophodonta)1
"Strophodonta thomasi" = Strophomena (Strophodonta)
0.4%: originally entered as "Stropheodonta thomasi"
"Strophodonta biplacata" = Strophomena (Strophodonta)1
 Strophomenida - Strophonellidae
Strophonella sp. Hall 1879
1.0%
Rhynchonellata
 Spiriferida - Cyrtospiriferidae
 Spiriferida - Spinocyrtiidae
 Spiriferida - Theodossiidae
 Spiriferida - Mucrospiriferidae
 Atrypida - Atrypidae
 Rhynchonellida - Trigonirhynchiidae
 Orthida - Schizophoriidae
"Schizophoria iowaensis" = Schizophoria (Schizophoria) iowensis
"Schizophoria iowaensis" = Schizophoria (Schizophoria) iowensis Hall 1858
11%
Bivalvia
 Lucinida - Mactromyidae
Paracyclas sabini clam
0.8%: originally entered as "Paracylcas sabini"
Gastropoda
 Euomphalina - Platyceratidae
"Diaphorostoma antiquum" = Platyostoma antiquuis
"Diaphorostoma antiquum" = Platyostoma antiquuis Webster 1905 snail
1.5%
 Euomphalina - Palaeotrochidae
"Floyda gigantea" = Floyda concentrica
"Floyda gigantea" = Floyda concentrica Webster 1905 snail
2.9%: originally entered as "Floydia gigantea"
 Bellerophontida -
""Bellerophontoidea" indet." = Bellerophontoidea2
""Bellerophontoidea" indet." = Bellerophontoidea2 M'Coy 1851 snail
0.2%
Stenolaemata
 Fenestrida - Fenestellidae
Fenestella sp. Lonsdale 1839
0.2%
 Trepostomata -
Leioclema occidens
0.8%: originally entered as "Lioclema occidens"
 Trepostomata - Amplexoporidae
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
0.2%: "fragments"
unclassified
  -
"Metazoa indet." = Animalia
"Metazoa indet." = Animalia Linnaeus 1758
0.8%: "worm tubes"
Anthozoa
 Stauriida - Phillipsastreidae
Pachyphyllum woodmani horn coral
0.4%
 Stauriida - Zaphrentidae
Heliophyllum solidum horn coral
2.5%