Cupulocorona osgoodensis Assoc., St. Clair Limestone, North-Central Arkansas (Silurian of the United States)

Where: Arkansas (35.8° N, 91.6° W: paleocoordinates 27.5° S, 58.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: St. Clair Limestone Formation, Wenlock (433.4 - 427.4 Ma)

• "Late [sic; this must be misprint for Lower] to middle Wenlockian, apparently mostly Kockelella ranuliformis Zone, but extending into the lower K. Amsdeni Zone."

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal grainstone and shelly/skeletal wackestone

• "brachiopods and echinoderms usually whole and spar-filled...holdfasts uncommon..overall little evidence of current or wave action, but occasional winnowed debris layers occur...Both echinoderms and brachiopods suggest shallow BA 4"

•SEP environmental call based on scanty given info. and ref (see 26022)

• "Very fossiliferous. Two lithologies are common, brachiopodal grainstone and wackestone, with echinodermal packstones and wackestones locally prominent. Bedding is sometimes obscure, with units commonly ranging beteen 2-10 cm thickness. Spar or lime mud cement are equally common, but siliciclastics generally comprise less than 10% of the unit."

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 26800: authorized by Michael Foote, entered by Michael Foote on 01.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Echinoderms only. See PBDB collections 26022 and 26023 for articulate brachiopods. Ulrich and Messer (1926, GSA Bull. 37:243) are cited for other faunal elements.
Show authors, comments, and common names
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites sp.
 Sphaeronitida - Holocystitidae
Holocystites (Holocystites) alternatus
Blastoidea
 Coronata - Stephanocrinidae
Cupulocorona osgoodensis, Cupulocorona gemmiformis
Cupulocorona gemmiformis Hall 1872 blastoid
  -
aff. Lysocystites sp.
aff. Lysocystites sp. blastoid
"undescribed taxon related to Lysocystites"
Crinoidea
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp.
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Monobathrida - Patelliocrinidae
Macrostylocrinus sp.