Edgewood Group, Locality A (Silurian of the United States)

Where: Pike County, Missouri (39.3° N, 91.0° W: paleocoordinates 22.3° S, 58.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Bryant Knob Formation, Llandovery (443.4 - 433.4 Ma)

• "Fossil collections from a silicified coquina ~5 ft above exposed base of the Bryant Knob Fm., and from silicified fossils in the upper 4 ft of the Bryant Knob."

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, ooidal, cherty/siliceous limestone

• "Unrestricted offshore environment of moderate depth involving some water movement by waves and (or) currents." "Light gray organo-detrital limestone,; mostly spar cement, minor micrite, some oolites."

Preservation: replaced with silica

Primary reference: T. W. Amsden. 1974. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri. Bulletin - Oklahoma Geological Survey 119:1-154 [J. Alroy/M. Sommers]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 3348: authorized by John Alroy, entered by Mike Sommers on 30.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods (articulated) only.
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Rhynchonellata
 Athyridida - Meristellidae
 Atrypida - Atrypinidae
Eospirigerina putilla Hall and Clarke 1894
 Orthida - Dalmanellidae