Atoka Formation

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Atoka Formation
Stratigraphic range: Pennsylvanian
TypeGeologic formation
UnderliesHartshorne Sandstone
OverliesBloyd Formation, Johns Valley Formation
Lithology
PrimarySandstone
OtherShale
Location
RegionArkansas, Oklahoma
CountryUnited States
Type section
Named byJ.A. Taff[1]

Named after Atoka County, Oklahoma, the Atoka Formation is a geologic formation in central and western Arkansas, eastern Oklahoma, central and western Texas, and eastern New Mexico.[2] It is the surface rock of the Boston Mountains and dominates exposures in the Frontal Ouachita Mountains of the Arkansas River Valley.[2]

Sedimentology

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The Atoka Formation is a sequence of marine sandstones, siltstones, and shales, and may be as thick at 25,000 feet in the Ouachita Mountains.[2] The formation is conformable with the Bloyd Shale in the Boston Mountains and the Johns Valley Formation in the Ouachita Mountains.[2]

Paleofauna

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Conodonts

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C. lauta[3]
C. sinuata[4]
G. wapanuckensis[5]
G. bella[6]
L. lexingtonensis[8]
O. recta[9]
P. attenuata[10]
P. ouachitensis[11]
S. cancellosus[12]
S. gracilis[13]

Foraminifera

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F. devexa[14]
F. oliviformis[15]
F. prolifica[16]
H. bulbosa[17]
I. semicronstrictus[18]
P. atokensis[19]
P. fittsi[20]
P. millcreekensis[21]
R. fittsi[22]
R. tumidulus[23]
T. sphaeroidalis[24]

Trace Fossils

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C. arkansanus[25]

References

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