Bromide Formation, Mountain Lake Member Ostracods (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 (457.3 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: 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.
• "[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

Collection methods: chemical,

Primary reference: R. O. Fay and A. A. Graffham. 1982. Biostratigraphic and paleontological studies. Echinoderm faunas from the Bromide Formation (Middle Ordovician) of Oklahoma: Lawrence, Kansas, University of Kansas Paleontological Institute Monograph 11 30-33 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23885: authorized by Steven Holland, entered by Tori Hanson on 23.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Modified from Harris, 1957.
unclassified
  -
Ostracoda
 Beyrichicopida - Bolliidae
 Leperditellocopida - Schmidtellidae
 Leperditellocopida - Aparchitidae
 Hollinocopida - Tetradellidae
 Hollinocopida - Euprimitiidae
Primitiella varicata ostracod
Primitiella constricta varicata
 Hollinocopida - Eurychilinidae
 Hollinocopida - Primitiopsidae
 Beyrichiacea - Zygobolbidae
 Palaeocopida - Cryptophyllidae
 Palaeocopida - Leperditellidae
Leperditella minima ostracod
Leperditella rex minima
Kayina hybosa ostracod
? Kayina porosa ostracod
Punctaparchites rugosus Jones 1858 ostracod
 Palaeocopida - Beyrichiidae
 Palaeocopida - Hollinidae
Ctenobolbina varicata ostracod
Ctenobolbina canellata varicata
Eohollina papillata ostracod
Eohollina depressa papillata
 Platycopida - Paraparchitidae
 Podocopida - Beecherellidae
 Podocopida - Bythocyprididae
Bythocypris cylindrica Hall 1871 ostracod
 Podocopida - Bairdiidae
 Podocopida - Balticellidae
Balticella elongata ostracod
Balticella deckeri elongata