Upper Cystoid Zone, Fittstown Roadcut on Oklahoma State Highway 90 (Ordovician of the United States)

Also known as just west of the center of Sec. 12, T. 1 N., R. 6 E.

Where: Oklahoma (34.6° N, 96.6° W: paleocoordinates 22.4° S, 73.1° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Mountain Lake Member (Bromide Formation), Blackriveran (460.9 - 449.5 Ma)

• Mountain Lake Member, Cystoid Zone

• member-level stratigraphic resolution

Environment/lithology: marine; gray sandstone and gray shale

• Upper and lower shoreface; transition zone; shallow lagoonal; shallow shelf or carbonate ramp. Environments from M. W. Longman. 1982. Depositional environments. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 : 17-29. Edited by J. Sprinkle.
• "[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: macrofossils

Primary reference: E. R. Branson and R. E. Peck. 1940. A new cystoid from the Ordovician of Oklahoma. Journal of Paleontology 14(1):89-92 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 196808: authorized by Pete Wagner, entered by Pete Wagner on 08.10.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

• Stratigraphic positions of Bromide echinoderms as used by authors from 1903-1980.
Eocrinoidea
  - Palaeocystitidae
Bromidocystis bassleri2 Sprinkle 1982
Diploporita
 Glyptosphaeritida - Eumorphocystidae
"Eumorphocystis multiporata n. gen. n. sp." = Eumorphocystis multiporata, "Strimplecystis oklahomensis" = Eumorphocystis multiporata1
"Eumorphocystis multiporata n. gen. n. sp." = Eumorphocystis multiporata Branson and Peck 1940
"Strimplecystis oklahomensis" = Eumorphocystis multiporata1 Branson and Peck 1940