Ridley - Wilson, 1949 (Ordovician of the United States)

Where: Tennessee (35.5° N, 86.5° W: paleocoordinates 28.1° S, 66.4° W)

• basin-level geographic resolution

When: Baltoniodus gerdae conodont zone, Ridley Limestone Formation, Blackriveran (460.9 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, bioturbated, peloidal, shelly/skeletal packstone and wackestone

• Geological information from field work of S.M. Holland and M.E. Patzkowsky
• medium to thick bedded skeletal to peloidal wackestones to packstones. highly bioturbated. includes some beds of skeletal (echinodermal) grainstones.

Size class: macrofossils

Preservation: original calcite, replaced with calcite

Primary reference: C. W. Wilson. 1949. Pre-Chattanooga stratigraphy in Central Tennessee. Tennessee Division of Geology Bulletin 56:1-415 [S. Holland/S. Holland]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5329: authorized by Steven Holland, entered by Steven Holland on 23.09.1999, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Wilson made a composite of faunal lists from Coryell (1921) and Bassler (1939)
Show authors, comments, and common names
Demospongiae
 Lithistida - Anthaspidellidae
Zittelella varians
Zittelella varians Billings 1861 demosponge
Stromatoporoidea
 Labechiida - Stromatoceriidae
Stromatocerium cf. rugosum
Stromatocerium cf. rugosum Hall 1847 stromatoporoid sponge
Stenolaemata
  - Phylloporinidae
Chasmatopora sublaxa
 Cryptostomata - Arthrostylidae
Helopora spiniformis
 Cryptostomata - Ptilodictyidae
Stictoporella cribrilina
 Cryptostomata - Escharoporidae
Escharopora subrecta
 Cryptostomata - Rhinidictyidae
Rhinidictya nashvillensis, Rhinidictya salemensis, Rhinidictya tabulata, Pachydictya cf. foliata
 Trepostomida -
Nicholsonella pulchra, Nicholsonella frondifera
 Trepostomida - Monticuliporidae
Orbignyella sublamellosa, Monticulipora discula
Orbignyella sublamellosa Ulrich and Bassler 1904
 Cystoporata - Constellariidae
Constellaria lamellosa
 Cystoporata - Ceramoporidae
Anolotichia explanata
 Trepostomata - Dittoporidae
Hemiphragma irrasum
Hemiphragma irrasum Ulrich 1893
 Trepostomata - Heterotrypidae
Dekayella ridleyana
 Trepostomata - Halloporidae
Hallopora spissata, Dianulites cf. petropolitanus
 Trepostomata - Trematoporidae
"Stromatotrypa lamellata" = Batostoma
"Stromatotrypa lamellata" = Batostoma
Strophomenata
 Strophomenida - Strophomenidae
Strophomena filitexta, Strophomena incurvata
Strophomena incurvata Shephard 1838
 Strophomenida - Furcitellidae
"Rafinesquina incrassata" = Dactylogonia incrassata
"Rafinesquina incrassata" = Dactylogonia incrassata Hall 1847
Rhynchonellata
 Atrypida - Anazygidae
Zygospira saffordi
 Rhynchonellida - Ancistrorhynchidae
Ancistrorhyncha costata1
Ancistrorhyncha costata1 Ulrich and Cooper 1942
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Hesperorthidae
Hesperorthis australis1
 Orthida - Plaesiomyidae
Chaulistomella ridleyensis1
 Orthida - Draboviidae
"Pianodema stonensis" = Fascifera stonensis, "Pianodema subaequata" = Pionodema subaequata
"Pianodema stonensis" = Fascifera stonensis Safford 1869
"Pianodema subaequata" = Pionodema subaequata Conrad 1843
Cooper (1956): this is probably a misidentification
Cephalopoda
 Actinocerida - Gonioceratidae
Gonioceras anceps
Gastropoda
 Murchisoniina - Lophospiridae
Eunema centralis2
Eunema centralis2 Ulrich and Scofield 1897 snail
 Euomphalina - Holopeidae
"Eccyliomphalus contiguus" = Pachystrophia contiguus
"Eccyliomphalus contiguus" = Pachystrophia contiguus Ulrich and Scofield 1897 snail
 Euomphalina - Macluritidae
Maclurites magnus
Maclurites magnus Le Sueur 1818 snail
 Bellerophontida - Plectonotidae
Tetranota bidorsata
Tetranota bidorsata Hall 1847 snail
 Pleurotomariida - Eotomariidae
Liospira progne, Liospira americana
Liospira progne Billings 1860 snail
Liospira americana Billings 1860 snail
 Pleurotomariida - Gosseletinidae
"Liospira convexa" = Cataschisma convexum
"Liospira convexa" = Cataschisma convexum Ulrich and Scofield 1897 snail
Ostracoda
 Leperditicopida - Leperditiidae
Leperditia fabulites
 Hollinocopida - Eurychilinidae
Eurychilina aequalis
 Beyrichicopida - Drepanellidae
Drepanella ampla
 Palaeocopida - Hollinidae
Ctenobolbina subcrassa
Trilobita
 Phacopida - Pterygometopidae
Pterygometopus troosti
Tetradium
  -
Tetradium syringoporoides
1Cooper 1956; 2Wagner 2022