Trilobites of the St Clair Limestone, Arkansas (Silurian of the United States)

Where: Arkansas (35.8° N, 91.6° W: paleocoordinates 27.5° S, 58.4° W)

• coordinate based on political unit

• local area-level geographic resolution

When: St. Clair Limestone Formation, Wenlock (433.4 - 427.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal, gray grainstone and gray lime mudstone

• SEP environmental call based on scanty given info. and ref (see 26022)
• "consists predominantly of grey to pink or red pelmatozoan biosparite and grey biomicrite and at certain horizons contains abundant trilobites, brachiopods, mollusks, and ostracodes"

Primary reference: D. J. Holloway. 1980. Middle Silurian trilobites from Arkansas and Oklahoma, U.S.A. Palaeontographica Abteilung A 170(1-3):1-85 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26020: authorized by Michael Foote, entered by Michael Foote on 30.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Trilobites (exclusive of Dalmanitacea) only. Dalmanitacea added on basis of Holloway (1981; PBDB ref. 7209).
 Aulacopleurida - Aulacopleuridae
Harpidella butorus n. sp. trilobite
Harpidella "sp. 1" McCoy 1849 trilobite
Harpidella "sp. 2" McCoy 1849 trilobite
Harpidella sp. McCoy 1849 trilobite
pygidium indet.
 Aulacopleurida - Brachymetopidae
Radnoria sp. n. sp.
Radnoria sp. n. sp. Owens and Thomas 1975 trilobite
 Phacopida - Phacopidae
Eophacops fontana n. sp. trilobite
Ananaspis sp. n. sp. Campbell 1967 trilobite
 Phacopida - Dalmanitidae
Glyptambon verrucosus n. gen., "Dalmanites howelli" = Dalmanites, "Dalmanites "sp. 1"" = Dalmanites, "Dalmanites "sp. 2"" = Dalmanites, "Dalmanites "sp. 3"" = Dalmanites, "Dalmanites ptyktorhion n. sp." = Dalmanites, "Ommokris bassleri n. gen." = Dalmanites, Lygdozoon collatum n. gen. n. sp., Lygdozoon arkansanum, Lygdozoon anoplos n. sp., Lygdozoon "sp. 1", Lygdozoon "sp. 2", Delops sp.
Glyptambon verrucosus n. gen. trilobite
"Dalmanites howelli" = Dalmanites trilobite
"Dalmanites "sp. 1"" = Dalmanites Barrande 1852 trilobite
"Dalmanites "sp. 2"" = Dalmanites Barrande 1852 trilobite
"Dalmanites "sp. 3"" = Dalmanites Barrande 1852 trilobite
"Dalmanites ptyktorhion n. sp." = Dalmanites trilobite
"Ommokris bassleri n. gen." = Dalmanites trilobite
Lygdozoon collatum n. gen. n. sp. trilobite
Lygdozoon anoplos n. sp. trilobite
Lygdozoon "sp. 1" Holloway 1981 trilobite
Lygdozoon "sp. 2" Holloway 1981 trilobite
Delops sp. Rickards 1965 trilobite
 Phacopida - Encrinuridae
Balizoma sp. n. gen. Holloway 1980 trilobite
Staurocephalus lagena n. sp. trilobite
Staurocephalus oarion n. sp. trilobite
 Phacopida - Cheiruridae
Cheirurus phollikodes n. sp. trilobite
Cheirurus prolixus n. sp. trilobite
Cheirurinae indet. Hawle and Corda 1847 trilobite
Sphaerexochus glaber n. sp. Holloway 1980 trilobite
 Phacopida - Calymenidae
 Proetida - Tropidocoryphidae
Cornuproetus kyphora n. sp. trilobite
 Proetida - Proetidae
Proetidae indet. Salter 1864 trilobite
Proetus vaningeni trilobite
P. (s.l.)
Decoroproetus anaglyptus n. sp. trilobite
Decoroproetus "sp. 1" Pribyl 1946 trilobite
Decoroproetus "sp. 2" Pribyl 1946 trilobite
Decoroproetus "sp. 3" Pribyl 1946 trilobite
Decoroproetus "sp. 4" Pribyl 1946 trilobite
 Asaphida - Raphiophoridae