Bloyd Formation

Bloyd Formation
Bloyd Formation
Stratigraphic range: Pennsylvanian
	File:Hustedia brentwoodensis opening.jpg Fossil from the Bloyd Formation
Type	Formation
Sub-units	Baldwin coal, Brentwood Member, Dye Shale Member, Kessler Limestone Member, Parthenon Sandstone Member, and Woolsey Member
Underlies	Atoka Formation
Overlies	Hale Formation
Lithology
Primary	Shale
Other	Sandstone, limestone
Location
Region	Arkansas
Country	United States
Type section
Named for	Bloyd Mountain, Washington County, Arkansas
Named by	Albert Homer Purdue

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 (in stratigraphic order):

Kessler Limestone Member
Dye Shale Member
Parthenon Sandstone Member (also known as the "middle Bloyd sandstone")^[5]
Woolsey Member
Baldwin coal (an informal unit at the top of the Woolsey Member)
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

Brachiopods

Anthracospirifer

A. newberryi^[6]

Antiquatonia

A. coloradoensis^[6]

Hustedia

H. brentwoodensis^[6]

Linoproductus

L. nodosus^[6]

Orthotetes^[6]
Rhynchopora

R. magnicosta^[6]

Tesuquea

T. formosa^[6]

Bryozoans

Anisotrypa^[7]
Coscinotrypa

C. fayettevillensis^[7]

C. gracilens^[7]

Fenestella

F. morrowensis^[7]

F. serratula^[7]

F. venusta^[7]

Fistulipora^[7]
Glyptopora

G. crassitoma^[7]

Lyropora^[8]
Matheropora

M. triseriata^[7]

Polypora

P. anastomosa^[7]

P. constricta^[7]

P. elliptica^[7]

P. kesslerensis^[7]

P. magna^[7]

P. purduei^[7]

P. triseriata^[7]

P. washingtonensis^[7]

Phyllopora

P. cribosa^[7]

Prismopora

P. concava^[7]

Rhombopora

R. attenuata^[7]

R. lepidodendroides^[7]

R. snideri^[7]

R. tabulata^[7]

Septopora

S. implexa^[7]

S. reversispina^[7]

Sulcoretepora

S. brentwoodensis^[7]

S. sinuomarginata^[7]

Tabulipora

T. tuberculata^[7]

Cephalopods

Axinolobus

A. modulus^[9]

A. quinni^[9]

Bisatoceras

B. micromphalus^[9]

B. secundum^[9]

Boesites

B. scotti^[9]

Branneroceras

B. branneri^[9]

Cancelloceras^[9]
Cymoceras

C. miseri^[9]

Diaboloceras

D. neumeieri^[9]

Euloxoceras^[10]

Gaitherites

G. morrowensis^[9]

Gastrioceras

G. adaense^[9]

G. araium^[9]

G. attenuatum^[9]

G. branneri^[10]

G. fittsi^[10]^[9]

Glaphyrites

G. depressus^[10]

G. morrowensis^[10]

G. oblatus^[10]

Homoceratoides

H. crancens^[10]

Liroceras^[10]
Metadimorphoceras

M. subdivisum^[9]

Mooreoceras

M. normale^[10]

Perigrammoceras^[10]
Phaneroceras

P. compressum^[9]

P. kesslerense^[9]

Proshumardites

P. morrowanus^[10]^[9]

Pseudoparalegoceras

P. compressum^[10]

P. kesslerense^[10]

Pseudopronorites

P. arkansiensis^[9]

P. quinni^[9]

Pseudorthoceras

P. knoxense^[10]

Pygmaeoceras

P. pygmaeum^[10]

P. solidum^[10]

Solenochilus^[10]
Stearoceras

S. smithi^[10]

Stenopronorites

S. arkansiensis^[10]

Syngastrioceras

S. globosum^[9]

S. oblatum^[9]

Verneuilites

V. pygmaeus^[9]

Wiedeyoceras

W. smithi^[9]

Conodonts

Adetognathus

A. gigantus^[11]

A. lautus^[11]

Hibbardella^[11]
Idiognathodus

I. sinuosis^[11]

Idiognathoides

I. convexus^[11]

Ligonodina

L. typa^[11]

Metalonchodina^[11]
Neognathodus

N. kunamai^[11]

Neoprioniodus^[11]
Spathognathodus

S. minutus^[11]

Streptognathodus

S. suberectus^[11]

Crinoids

Affinocrinus

A. grandis^[12]

A. progressus^[12]

Alcimocrinus

A. girtyi^[12]

Allocatillocrinus

A. rotundus^[12]

A. rotundus multibrachiatus^[12]

Anchicrinus

A. planulatus^[12]

A. rugosus^[12]

Anobasicrinus

A. braggsi^[12]

Arkacrinus

A. constrictus^[12]

A. dubius^[12]

Atokacrinus

A. tumulosus^[12]

Calycocrinus

C. furnishi^[12]

C. symmetricus^[12]

Cibolocrinus

C. circulus^[12]

C. regularis^[12]

C. spinosus^[12]

C. tumidus^[12]

Cromyocrinus

C. grandis^[12]

Dicromyocrinus

D. optimus^[12]

D. subaplatus^[12]

Diphuicrinus

D. croneisi^[12]

D. pentanodus^[12]

Endelocrinus

E. matheri^[12]

Globacrocrinus

G. pirum^[12]

Lassanocrinus

L. daileyi^[12]

L. minutus^[12]

L. multinodus^[12]

L. nodus^[12]

L. strigosus^[12]

Lecythiocrinus

L. asymmetricus^[12]

Megaliocrinus

M. aplatus^[12]

M. exotericus^[12]

Metacromyocrinus

M. gillumi^[12]

M. papulosus^[12]

Metautharocrinus

M. cockei^[12]

M. spinifer^[12]

Morrowocrinus

M. fosteri^[12]

Palmerocrinus

P. kesslerensis^[12]

Paracromyocrinus

P. oklahomensis^[12]

Paradelocrinus

P. aequabilis^[12]

Paragassizocrinus

P. caliculus^[12]

P. magnus^[12]

Paramphicrinus

P. magnus^[12]

Perimestocrinus

P. pumilus^[12]

P. teneris^[12]

Phacelocrinus

P. brevis^[12]

P. rosei^[12]

Planacrocrinus

P. conicus^[12]

P. minutus^[12]

Platyacrocrinus

P. brentwoodensis^[12]

Platycrinites^[12]
Sciadiocrinus

S. cascus^[12]

S. crassacanthus^[12]

Scytalocrinus

S. crassibrachiatus^[12]

Stenopecrinus

S. ornatus^[12]

Stereobrachicrinus

S. pustulosus^[12]

Strongylocrinus

S. hansoni^[12]

S. ornatus^[12]

Ulrichicrinus

U. oklahoma^[12]

U. pentanodus^[12]

Flora

Archaeolithophyllum

A. missouiense^[13]

Cuneiphycus

C. aliquantulus^[13]

G. minuta^[13]

Paraepimastopora^[13]
Stachedoides

S. spissa^[13]

Foraminifera

A. rugosus^[13]

Biseriella^[13]
Calcitornella^[13]

C. adherens^[13]

Climacammina^[8]
Diplospahaerina

D. inaequalis^[13]

E. donbassicus^[13]

H. harltoni^[13]

Millerella

M. marblensis^[8]^[13]

M. pressa^[13]

Monotaxinoides

M. transitorius^[13]

P. pinguis^[8]

Planoendothyra

P. evoluta^[13]

T. maxima^[13]

Trepeilopsis^[8]

T. minima^[13]

Tuberatina^[8]

T. plana^[13]

Turrispiroides

T. multivolutus^[13]

Ostracods

Amphissites

A. confluens^[14]

A. nodosus^[14]

A. rothi^[14]

Bairdiolites^[15]
Hollinella

H. bassleri^[14]

Kegelites^[15]
Kirkbya^[15]

K. bendensis^[14]

K. jolliffana^[14]

Pseudoparaparchites^[15]

Sponges

Haplistion

H. sphaericum^[16]

Steioderma

S. hadra^[16]

Virgaspongia

V. ichnata^[16]

Trace Fossils

Conostichus

C. arkansanus^[17]

Incertae sedis

Asphaltina

A. cordillerensis^[13]

Clacisphaera

C. laevis^[13]

P. strigosa^[13]

References

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Bloyd Formation

Contents

Stratigraphy

Paleontology

Brachiopods

Bryozoans

Cephalopods

Conodonts

Crinoids

Flora

Foraminifera

Ostracods

Sponges

Trace Fossils

Incertae sedis

See also

References

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Bloyd Formation

Stratigraphy

Paleontology

See also

References

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