Rockford (Guber) (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's assistant Guber

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 3405: authorized by John Alroy, entered by John Alroy on 31.07.1999, edited by Alycia Stigall

Creative Commons license: CC BY (attribution)

Taxonomic list

• total number of specimens 334
Strophomenata
 Productida - Productellidae
 Productida - Monticuliferidae
 Strophomenida - Douvillinidae
 Strophomenida - Leptostrophiidae
 Strophomenida - Strophodontidae
"Strophodonta thomasi" = Strophomena (Strophodonta)
"Strophodonta thomasi" = Strophomena (Strophodonta)
0.6%: originally entered as "Stropheodonta thomasi"
 Strophomenida - Strophonellidae
Strophonella sp. Hall 1879
0.6%
Rhynchonellata
 Spiriferida - Cyrtospiriferidae
 Spiriferida - Spinocyrtiidae
 Spiriferida - Theodossiidae
 Atrypida - Atrypidae
 Orthida - Schizophoriidae
"Schizophoria iowaensis" = Schizophoria (Schizophoria) iowensis Hall 1858
9%
Bivalvia
 Lucinida - Mactromyidae
Paracyclas sabini clam
0.3%: originally entered as "Paracylcas sabini"
Gastropoda
 Euomphalina - Platyceratidae
"Diaphorostoma antiquum" = Platyostoma antiquuis
"Diaphorostoma antiquum" = Platyostoma antiquuis Webster 1905 snail
1.2%
 Euomphalina - Palaeotrochidae
Westerna gigantea Webster 1888 snail
0.3%: originally entered as "Westernia gigantea"
"Floyda gigantea" = Floyda concentrica Webster 1905 snail
0.9%: originally entered as "Floydia gigantea"
Stenolaemata
 Trepostomata -
Leioclema occidens
2.0%: originally entered as "Lioclema occidens"
 Trepostomata - Amplexoporidae
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
0.6%: "crinoid fragments"
unclassified
  -
"Metazoa indet." = Animalia
"Metazoa indet." = Animalia Linnaeus 1758
0.3%: "worm tubes"
Anthozoa
 Stauriida - Phillipsastreidae
Pachyphyllum woodmani horn coral
0.3%
 Stauriida - Zaphrentidae
Heliophyllum solidum horn coral
3.2%