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Bromide Formation, Mountain Lake Member (Lower Zone), Oklahoma (Ordovician of the United States)

Where: Oklahoma (34.0° N, 97.0° W: paleocoordinates 22.5° S, 73.8° 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, Lower 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: R. O. Fay, A. A. Graffham, and J. Sprinkle. 1982. Previous studies of Bromide echinoderms. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 34-44 [S. Holland/T. Hanson/T. Hanson] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23990: authorized by Steven Holland, entered by Tori Hanson on 25.07.2002

Creative Commons license: CC BY (attribution)