Bloyd Formation


The Bloyd Formation, or Bloyd Shale, is a geologic formation in Arkansas. It preserves fossils dating back to the Carboniferous period.

Stratigraphy

The Bloyd Formation conformably overlies the Hale Formation and unconformably underlies the Atoka Formation. Five formal and one informal members are recognized in the Bloyd Formation :
  • Kessler Limestone Member
  • Dye Shale Member
  • Parthenon Sandstone Member
  • Woolsey Member
  • Baldwin coal
  • Brentwood Limestone Member
In the eastern parts of the Ozarks in Arkansas, the Bloyd Formation becomes undifferentiated with the underlying Hale Formation and is called the Witts Springs Formation.

Paleontology

[Brachiopod]s

  • Anthracospirifer
  • Antiquatonia
  • Hustedia
  • Linoproductus
  • Orthotetes
  • Rhynchopora
  • ''Tesuquea''

    [Bryozoa]ns

  • Anisotrypa
  • Coscinotrypa
  • Fenestella
  • Fistulipora
  • Glyptopora
  • Lyropora
  • Matheropora
  • Polypora
  • Phyllopora
  • Prismopora
  • Rhombopora
  • Septopora
  • Sulcoretepora
  • ''Tabulipora''

    [Cephalopod]s

  • Axinolobus
  • Bisatoceras
  • Boesites
  • Branneroceras
  • Cancelloceras
  • Cymoceras
  • Diaboloceras
  • Euloxoceras
  • Gaitherites
  • Gastrioceras
  • Glaphyrites
  • Homoceratoides
  • Liroceras
  • Metadimorphoceras
  • Mooreoceras
  • Perigrammoceras
  • Phaneroceras
  • Proshumardites
  • Pseudoparalegoceras
  • Pseudopronorites
  • Pseudorthoceras
  • Pygmaeoceras
  • Solenochilus
  • Stearoceras
  • Stenopronorites
  • Syngastrioceras
  • Verneuilites
  • ''Wiedeyoceras''

    [Conodont]s

  • Adetognathus
  • Hibbardella
  • Idiognathodus
  • Idiognathoides
  • Ligonodina
  • Metalonchodina
  • Neognathodus
  • Neoprioniodus
  • Spathognathodus
  • ''Streptognathodus''

    [Crinoid]s

  • Affinocrinus
  • Alcimocrinus
  • Allocatillocrinus
  • Anchicrinus
  • Anobasicrinus
  • Arkacrinus
  • Atokacrinus
  • Calycocrinus
  • Cibolocrinus
  • Cromyocrinus
  • Dicromyocrinus
  • Diphuicrinus
  • Endelocrinus
  • Globacrocrinus
  • Lassanocrinus
  • Lecythiocrinus
  • Megaliocrinus
  • Metacromyocrinus
  • Metautharocrinus
  • Morrowocrinus
  • Palmerocrinus
  • Paracromyocrinus
  • Paradelocrinus
  • Paragassizocrinus
  • Paramphicrinus
  • Perimestocrinus
  • Phacelocrinus
  • Planacrocrinus
  • Platyacrocrinus
  • Platycrinites
  • Sciadiocrinus
  • Scytalocrinus
  • Stenopecrinus
  • Stereobrachicrinus
  • Strongylocrinus
  • ''Ulrichicrinus''

    [Flora]

  • Archaeolithophyllum
  • Cuneiphycus
  • Donezella
  • Eflugelia
  • Girvanella
  • Paraepimastopora
  • ''Stachedoides ''

    [Foraminifera]

  • Ammodiscus
  • Ammovertella
  • Archaediscus
  • Asteroarchaediscus
  • Biseriella
  • Calcitornella
  • Climacammina
  • Diplospahaerina
  • Endothyra
  • Endothyranella
  • Eolasiodiscus
  • Eosigmoilina
  • Eostafella
  • Hemigordius
  • Millerella
  • Monotaxinoides
  • Neoarchaediscus
  • Palaeonubecularia
  • Paramillerella
  • Planoendothyra
  • Plectogyra
  • Pseudoglomospira
  • Tetrataxis
  • Trepeilopsis
  • Tuberatina
  • ''Turrispiroides''

    [Ostracod]s

  • Amphissites
  • Bairdiolites
  • Hollinella
  • Kegelites
  • Kirkbya
  • ''Pseudoparaparchites''

    [Sponge]s

  • Haplistion
  • Steioderma
  • ''Virgaspongia''

    Trace Fossils">Trace fossil">Trace Fossils

  • ''Conostichus''

    [Incertae sedis]

  • Asphaltina
  • Clacisphaera
  • Nostocites
  • Osagia
  • ''Proninella''