Petalocrinus mirabilis-Pentameroides-Coral Assoc., Buck Creek Member, E Iowa (Silurian to of the United States)

Where: Iowa (42.2° N, 91.1° W)

• Paleocoordinates: 27.2° S, 100.7° W (Wright 2013)

• coordinate based on political unit

• local area-level geographic resolution

When: Buck Creek Quarry Member (Scotch Grove Formation), Telychian to Telychian (438.5 - 430.5 Ma)

• "Late Llandoverian (C6) to Early Wenlockian..."

• member-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; graded, burrowed, cherty/siliceous packstone and graded, burrowed, cherty/siliceous grainstone

• "...crowns very rare..root systems common but generally not concentrated. The environment seems moderately active, basically an echinoderm shoal with other fauna intermixed and preserved only sporadically, probably most often in areas bordering the shoal proper, perhaps in slightly deeper and quieter water. The association with both coral-dominated and pentamerid-dominated communities indicates at least a BA 3-4 boundary position. The coral faunas are more diverse than typical BA2-3...'Costistricklandia', Dicoelosia, and Porpites in small numbers [suggest] outer BA3 to shallow BA4 for some sites...total range BA3 to shallow BA 4."

•

•SEP environmental call based on given description and same vol. page 807.

• "Very fossiliferous. Much of the B.C.Q. Mbr is sparsely fossiliferous skeletal-moldic dolowackestone, but localities with this community are very cherty, nonporous, moderately to well-silicified skeletal-replacement packstones-grainstones...some evidence of graded bedding and occasional crossbeds...much of the section appears to have been reworked by burrowers"

Preservation: replaced with silica

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26810: authorized by Michael Foote, entered by Michael Foote on 04.11.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Echinozoa indet.
Crinoidea
 Monobathrida - Patelliocrinidae
Macrostylocrinus sp.
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp.
Dimerocrinites sp. Phillips 1839 Sea lily
 Inadunata -
Inadunata indet.
 Myelodactylida - Myelodactylidae
Myelodactylus sp.
Myelodactylus sp. Hall 1852 Sea lily
 Pisocrinida - Pisocrinidae
Pisocrinus sp.
Pisocrinus sp. de Koninck 1858 Sea lily
 Cyathocrinida - Thalamocrinidae
Thalamocrinus sp.
Thalamocrinus sp. Miller and Gurley 1895 Sea lily
 Cyathocrinida - Petalocrinidae
Petalocrinus mirabilis
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Corynexochida - Illaenidae
Stenopareia sp.
Stenopareia sp. Holm 1886 trilobite
 Phacopida - Encrinuridae
Encrinurus sp.
Encrinurus sp. Emmrich 1844 trilobite
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Pentamerida - Pentameridae
Pentameroides subrectus, "Callipentamerus corrugatus" = Pentameroides (Callipentamerus)
Pentameroides subrectus Hall and Clarke 1892
"Callipentamerus corrugatus" = Pentameroides (Callipentamerus)
 Pentamerida - Stricklandiidae
"Costistricklandia" castellana
 Orthida - Dicoelosiidae
Dicoelosia sp.
Dicoelosia sp. King 1850
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Stromatoporoidea
 Stromatoporoidea -
Stromatoporoidea indet.
Stromatoporoidea indet. stromatoporoid sponge
 Clathrodictyida - Clathrodictyidae
Clathrodictyon sp.
Clathrodictyon sp. Nicholson and Murie 1878 stromatoporoid sponge
 Stromatoporida - Stromatoporidae
Stromatopora sp.
Stromatopora sp. Goldfuss 1826 stromatoporoid sponge
Anthozoa
  -
Anthozoa indet.
Anthozoa indet. Ehrenberg 1834
 Cystiphyllida - Goniophyllidae
Goniophyllum sp.
Goniophyllum sp. Milne-Edwards and Haime 1850 horn coral
 Cystiphyllida - Tryplasmatidae
Porpites sp.
Porpites sp. Schlotheim 1820 horn coral