McLish Ranch (Ordovician of the United States)

Where: Johnston County, Oklahoma (34.5° N, 96.5° W: paleocoordinates 22.5° S, 73.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Pygodus anserinus conodont zone, Mountain Lake Member (Bromide Formation), Turinian (460.9 - 449.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal; lithified, gray sandstone and lithified, gray shale

• "The lower 194 feet above the basal sandstone of the Bromide consists chiefly of shales with some thin limestone beds. Between 25 and 46 feet above the sandstone the brachiopod Sowerbyites is abundant in association with numerous massive bryozoans. Above this zone Valcourea transversa is abundant. At the top of the sequence and just under the light-colored nodular limestones of the Pooleville member numerous brachiopods are associated with the cystids Platycystites and Cheirocrinus. The uppermost beds contain the brachiopod Multicostella convexa Cooper. This brachiopod zone affords a means of comparison with other sections and gives a clue to the facies changes."

•"[B]asal tan to greenish-gray fine-grained quartz arenite sandstone, with well-rounded and frosted grains, overlain by a sandstone and greenish-gray illitic-chloritic shale above. The sandstone sequence is thickest (more than 37 m) along Lick Creek in the northwestern Arbuckles and thinnest (less than 9 m) in the eastern Arbuckles, losing sand at the top of the section. The overlying shale and limestone is thickest (more than 60 m) along the axis of aulacogen and is mostly shale. In a comparable section in the northeastern Arbuckles, limestone predominates with some sand, and the section is 24 to 31 m thick." Lithology from R, O. Fay and A. A. Graffman. 1982. Stratigraphic studies. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 : 11-16. Edited by J. Sprinkle.

Size class: microfossils

Reposited in the USNM

Collection methods: sieve,

Primary reference: G. A. Cooper. 1956. Chazyan and related brachiopods. Smithsonian Miscellaneous Collections 127:1-1245 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 186181: authorized by Pete Wagner, entered by Pete Wagner on 16.06.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Orthotetida - Triplesiidae
Onychoplecia tenuis n. sp. Cooper 1956
 Strophomenida - Strophomenidae
 Atrypida - Protozygidae
"Protozyga elongata" = Manespira elongata
"Protozyga elongata" = Manespira elongata Cooper 1956
 Rhynchonellida - Ancistrorhynchidae
 Orthida - Glyptorthidae
 Glyptocystitoida - Glyptocystitidae
Hesperocystis deckeri2 Sinclair 1945
  - Palaeocystitidae
Bromidocystis bassleri2 Sprinkle 1982
 Diplobathrida - Rhodocrinitidae
Bromidocrinus nodosus n. gen. n. sp.1
Bromidocrinus nodosus n. gen. n. sp.1 Kolata 1982 Sea lily