Alpena Bed 1 Surface Collection 1 (Carboniferous of the United States)

Where: Carroll County, Arkansas (36.3° N, 93.2° W: paleocoordinates 12.2° S, 34.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Hindsville Formation, Chesterian (335.5 - 323.2 Ma)

• The Hindsville formation is the lowermost Chesterian unit in northern Arkansas and unconformably overlies the Meramecian Boone Formation.

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified packstone

• Dark, brittle bioclastic packstone with abundant brachiopods and pyrite.

Size classes: macrofossils, mesofossils

Collected by N. A. Heim in 2004

Collection methods: bulk, sieve,

• Approximately 1 gallon of weathered sediments were collected from the surface and processed through a 1 mm sieve and all brachiopods were picked and identified to the genus level.

Primary reference: N. A. Heim. 2009. Stability of regional brachiopod diversity structure across the Mississippian/Pennsylvanian boundary. Paleobiology 35(3):393 [N. Heim/N. Heim/N. Heim]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 79819: authorized by Noel Heim, entered by Noel Heim on 25.03.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• only brachiopods were collected, although there were no other identifiable macro- or mesofossils. Individuals were counted using the minimum number of individuals method: articulated + the larger of the number of brachial or pedicle valves.
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Strophomenata
 Productida - Echinoconchidae
Echinoconchus sp.
 Orthotetida - Schuchertellidae
Schuchertella sp., Streptorhynchus sp.
Schuchertella sp. Girty 1904
 Orthotetida - Pulsiidae
Schellwienella sp.
 Orthotetida - Orthotetidae
Orthotetes sp.
Rhynchonellata
 Rhynchonellida - Tetracameridae
Tetracamera sp.
 Athyridida - Athyrididae
Cleiothyridina sp., Composita sp.
Cleiothyridina sp. Buckman 1906
Composita sp. Brown 1849
 Athyridida - Retziidae
Eumetria sp.
 Spiriferida - Spiriferidae
Anthracospirifer sp.