Pisocrinus(P.) gemmiformis-Astraeospongium Assoc., Lego Lst, McCory Lane Roadcut (Silurian to of the United States)

Where: Tennessee (38.1° N, 87.0° W: paleocoordinates 28.7° S, 52.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lego Limestone Member (Wayne Formation), Wenlock to Wenlock (433.4 - 423.0 Ma)

• Lego Limestone Member, Wayne Formation: top 2 m, mostly from shaley limestone unit 3 cm thick near top of unit. Kockelella amsdeni Zone-K. variabilis Zone

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; gray, calcareous shale and argillaceous limestone

• "Crinods and brachiopods may be preserved intact...but most frequently are diarticulated...root systems uncommon...little evidence of current winnowing or sorting, but the concentratioon of whole fossils in particular units may indicate either rare sstorm disturbance or a storm-caused sudden increase in sed. rate. Detrital limonite and partly oxidized glauconite grains up to sand size are common. Burrows locally common in some horizons....BA 4-5, somewhat restricted environment.."

•SEP environmental call based on given info

• "The most frequent lithology is a calcareous brownish-gray to reddish shale, often intercalated with thin beds of similarly colored shaley limestone.. In other occurrences the terrigenous component is definitely subordinate. Skeletal debris is often sparese..."

Collection methods: Taxa in table 45.46, which gives abundances.

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 26817: authorized by Michael Foote, entered by Michael Foote on 04.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cornulitida - Cornulitidae
Cornulites sp. Schlotheim 1820
 Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
Isorthis sp. Kozlowski 1929
 Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Spiriferida - Cyrtiidae
Striispirifer sp. Cooper and Muir-Wood 1951
 Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
 Rhynchonellida - Rhynchotrematidae
Stegerhynchus sp. Foerste 1909
 Athyridida - Meristellidae
Meristina sp. Hall 1867
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Sabellida - Serpulidae
Spirorbis sp. Daudin 1800
 Cuniculepadida - Lepidocoleidae
Lepidocoleus sp. Faber 1886 scale worm
Mollusca indet. Linnaeus 1758
Trilobita indet. Walch 1771 trilobite
Ostracoda indet. Latreille 1802 ostracod
Echinoidea indet. Leske 1778 sea urchin
Asteroidea indet. de Blainville 1830 sea star
"starfish plate"
 Sagenocrinida - Lecanocrinidae
 Pisocrinida - Pisocrinidae
Parapisocrinus quinquelobus Ausich and Copper 2010 Sea lily
 Calceocrinida - Calceocrinidae
 Mitrata -
Mitrata indet. Jaekel 1918
  - Cyclocystoididae
Sievertsia sp. n. sp. Smith and Paul 1982
Bryozoa indet. Ehrenberg 1831
 Octactinellida - Astraeospongiidae
 Rugosa -
Rugosa indet. horn coral
 Auloporida - Auloporidae
Auloporella indet. Grubbs 1939 tabulate coral