Dalmanellid-crinoid fauna of the Sowerbyella-Onniella community, Reedsville (Ordovician of the United States)

Where: Maryland (39.3° N, 77.7° W: paleocoordinates 29.2° S, 55.3° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Late/Upper Ordovician (458.4 - 443.4 Ma)

• "U. Ord. Reedsville and Martinsburg Fms."

Environment/lithology: transition zone or lower shoreface; siltstone

• "muddy silt. outer infralittoral; deeper than strophomenid fauna. geosyncline, highland to E"

Size class: macrofossils

Primary reference: P. W. Bretsky. 1970. Upper Ordovician Ecology of the Central Appalachians. Bulletin of the Peabody Museum of Natural History 34:1-150 [M. Uhen/J. Ju/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 411: authorized by Jack Sepkoski, entered by Mike Sommers on 03.12.1998, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Bretsky 1969, 1970"
Trilobita
 Phacopida - Calymenidae
Flexicalymene sp. Shirley 1936 trilobite
 Asaphida - Asaphidae
Isotelus sp. Dekay 1824 trilobite
 Asaphida - Trinucleidae
Cryptolithus sp. Green 1832 trilobite
Strophomenata
 Strophomenida - Sowerbyellidae
Rhynchonellata
 Atrypida - Anazygidae
 Orthida - Dalmanellidae
"Onniella multisecta" = Cincinnetina multisecta
"Onniella multisecta" = Cincinnetina multisecta James 1871
Bivalvia
 Myalinida - Ambonychiidae
"Ambonychia radiata" = Byssonychia radiata
"Ambonychia radiata" = Byssonychia radiata Hall 1847 clam
 Unioni - Lyrodesmatidae
Lyrodesma poststriatum Emmons 1842 clam
 Nuculida - Praenuculidae
 Nuculida - Nucularcidae
Nucularca pectunculoides Hall 1872 clam
originally entered as "? Ctenodonta pulchella"
Gastropoda
 Trochonematoidea - Lophospiridae
? Ruedemannia lirata Ulrich and Scofield 1897 snail
originally entered as "? Ruedemannia lirata"
Stenolaemata
 Trepostomata - Halloporidae
Hallopora sp. Bassler 1911
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
crinoids