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).
Show authors, comments, and common names
Trilobita
 Trinucleida - Raphiophoridae
Raphiophorus niagarensis
 Phacopida - Phacopidae
Eophacops fontana n. sp., Ananaspis sp. n. sp.
Eophacops fontana n. sp. trilobite
Ananaspis sp. n. sp. Campbell 1967 trilobite
 Phacopida - Dalmanitidae
Delops sp., Lygdozoon collatum n. gen. n. sp., Lygdozoon arkansanum, Lygdozoon anoplos n. sp., Lygdozoon "sp. 1", Lygdozoon "sp. 2", "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, Glyptambon verrucosus n. gen.
Delops sp. Rickards 1965 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
"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
Glyptambon verrucosus n. gen. trilobite
 Phacopida - Calymenidae
"Sthenarocalymene scutula n. sp." = Gravicalymene scutula, Diacalymene altirostris
"Sthenarocalymene scutula n. sp." = Gravicalymene scutula Holloway 1980 trilobite
 Phacopida - Encrinuridae
Staurocephalus lagena n. sp., Staurocephalus aff. lagena, Staurocephalus oarion n. sp., Staurocephalus aff. oarion, Encrinurus egani, Balizoma sp. n. gen.
Staurocephalus lagena n. sp. trilobite
Staurocephalus oarion n. sp. trilobite
Encrinurus egani trilobite
Balizoma sp. n. gen. Holloway 1980 trilobite
 Phacopida - Cheiruridae
Sphaerexochus glaber n. sp., Deiphon longifrons, Cheirurus phollikodes n. sp., Cheirurus cf. phollikodes, Cheirurus prolixus n. sp., Cheirurinae indet.
Sphaerexochus glaber n. sp. Holloway 1980 trilobite
Cheirurus phollikodes n. sp. trilobite
Cheirurus prolixus n. sp. trilobite
Cheirurinae indet. Hawle and Corda 1847 trilobite
 Proetida - Proetidae
Proetidae indet., Cornuproetus kyphora n. sp., "Proetus vaningeni" = Pseudogerastos vaningeni
Proetidae indet. Salter 1864 trilobite
Cornuproetus kyphora n. sp. Holloway 1980 trilobite
"Proetus vaningeni" = Pseudogerastos vaningeni Foerste 1923 trilobite
P. (s.l.)
 Proetida - Tropidocoryphidae
Decoroproetus anaglyptus n. sp., Decoroproetus "sp. 1", Decoroproetus "sp. 2", Decoroproetus "sp. 3", Decoroproetus "sp. 4", Decoroproetus corycoeus, Lepdioproetus (Dipharangus) xeo n. subgen. n. sp.
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
Decoroproetus corycoeus Conrad 1842 trilobite
Lepdioproetus (Dipharangus) xeo n. subgen. n. sp. trilobite
 Proetida - Aulacopleuridae
Harpidella butorus n. sp., Harpidella spinulocervix, Harpidella "sp. 1", Harpidella "sp. 2", Harpidella sp.
Harpidella butorus n. sp. trilobite
Harpidella "sp. 1" M'Coy 1849 trilobite
Harpidella "sp. 2" M'Coy 1849 trilobite
Harpidella sp. M'Coy 1849 trilobite
pygidium indet.
 Proetida - Brachymetopidae
Radnoria sp. n. sp.
Radnoria sp. n. sp. Wasmann 1894 trilobite