Bloyd Formation
# 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 (in stratigraphic order):

* Kessler Limestone Member
* Dye Shale Member
* Parthenon Sandstone Member (also known as the "middle Bloyd sandstone")
* 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

### Flora

* Archaeolithophyllum

    A. missouiense
* Cuneiphycus

    C. aliquantulus
* Donezella
* Eflugelia
* Girvanella

    G. minuta
* Paraepimastopora
* Stachedoides

    S. spissa

### Ostracods

* Amphissites

    A. confluens
    A. nodosus
    A. rothi
* Bairdiolites
* Hollinella

    H. bassleri
* Kegelites
* Kirkbya

    K. bendensis
    K. jolliffana
* Pseudoparaparchites

### Sponges

* Haplistion

    H. sphaericum
* Steioderma

    S. hadra
* Virgaspongia

    V. ichnata

### Trace Fossils

* Conostichus

    C. arkansanus

### Incertae sedis

* Asphaltina

    A. cordillerensis
* Clacisphaera

    C. laevis
* Nostocites
* Osagia
* Proninella

    P. strigosa
