Zones B & C, Tanyard Formation (Ordovician of the United States)

Where: Texas (30.3° N, 97.7° W: paleocoordinates 21.1° S, 90.8° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Rossodus manitouensis conodont zone, Tanyard Formation, Gasconadian (485.4 - 477.7 Ma)

• "L. Ord. zones B & C". (Those are trilobite zones; zone C for condonts; Skullrockian of modern usage. However, that includes the latest Cambrian.)

Environment/lithology: peritidal; flat-pebble limestone

• "ls., locally dessicated, rippled; f-p congl. peritidal (BA1)"

Size class: macrofossils

Primary reference: P. E. Cloud and V. E. Barnes. 1957. Early Ordovician Sea in Central Texas. Geological Society of America Memoirs 67(2):163-214 [P. Wagner/P. Wagner/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 271: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "P.E. Cloud Jr. and V.E.Barnes, 1957. Early Ord. sea in central Texas. pp163-214 in H.S.Ladd (ed) Treatise on marine ecology and paleoecology, v2[?illeg.] Paleoecolgy. GSA Mem.67"
Show authors, comments, and common names
unclassified
  -
Dateroceras sp.
Anthozoa
 Lichenariida - Lichenariidae
Lichenaria sp.
Lichenaria sp. Winchell and Schuchert 1895 tabulate coral
Gastropoda
 Euomphalina - Ophiletidae
Ophileta sp., Ozarkina sp.
Ophileta sp. Vanuxem 1842 snail
Ozarkina sp. Ulrich et al. 1931 snail
 Euomphalina - Macluritidae
"Macluritella sp." = Macluritella, "Prohelicotoma sp." = Macluritella
"Macluritella sp." = Macluritella Kirk 1927 snail
originally Lytospira; PJW3
"Prohelicotoma sp." = Macluritella Kirk 1927 snail
originally Helicotoma; PJW3
 Eogastropoda - Sinuopeidae
Gasconadia sp., Schizopea sp., "Sinuopea sp." = Sinuopea, "Chepultapecia sp." = Sinuopea
Gasconadia sp. Weller and St. Clair 1928 snail
Schizopea sp. Butts 1926 snail
"Sinuopea sp." = Sinuopea Ulrich 1911 snail
"Chepultapecia sp." = Sinuopea Ulrich 1911 snail
Cephalopoda
 Ellesmerocerida - Ellesmeroceratidae
Burenoceras sp., Oneotoceras sp., Clarkoceras sp., Conocerina sp., Levisoceras sp., Ectenoceras sp.
Burenoceras sp. Ulrich and Foerste 1931
Oneotoceras sp. Ulrich 1926
Clarkoceras sp. Ruedemann 1905
Conocerina sp. Ulrich and Foerste 1936
Levisoceras sp. Foerste 1925
Ectenoceras sp. Ulrich and Foerste 1936
Rostroconchia
 Ribeirioida - Technophoridae
Ribeiria sp.
Ribeiria sp. Sharpe 1853
Rhynchonellata
 Pentamerida - Tetralobulidae
Tetralobula sp.
Tetralobula sp. Ulrich and Cooper 1936
 Pentamerida - Clarkellidae
Syntrophina sp.
 Orthida - Finkelnburgiidae
Finkelnburgia sp.
Finkelnburgia sp. Walcott 1905
Trilobita
 Proetida - Hystricuridae
Paraplethopeltis sp.
Paraplethopeltis sp. Bridge and Cloud 1947 trilobite
 Corynexochida - Leiostegiidae
Leiostegium sp.
Leiostegium sp. Raymond 1913 trilobite