Cason Shale

Geologic formation in Arkansas, US
Cason Shale
Stratigraphic range: Ordovician-Silurian
TypeFormation
Unit ofnone
UnderliesBrassfield Limestone
OverliesFernvale Limestone
Thicknessup to appx. 23 feet[1]
Lithology
PrimaryShale
Location
RegionArkansas
CountryUnited States
Type section
Named forCason tract and mine, near Batesville, Independence County, Arkansas
Named byHenry Shaler Williams[2]

The Cason Shale is a Late Ordovician to Middle Silurian geologic formation in the Ozark Plateaus of Arkansas.[1] The name was introduced in 1894 by Henry Shaler Williams in his study of Arkansas.[2] Williams designated a type locality at what was known as the Cason tract and mine, near Batesville, Independence County, Arkansas, however, he did not assign a stratotype. As of 2017, a reference section has not been designated for this unit.

Paleofauna

Conodonts

A. inornatus[3]
A. unicostatus[3]
  • Ambalodus
A. triangularis[3]
  • Amorphognatus[3]
  • Belodella
B. flexa[3]
  • Belodina
B. inclinata[3]
B. ornata[3]
C. delicatus[3]
C. flexuosus[3]
  • Distacodus
D. mehli[3]
D. posterocostatus[3]
D. procerus[3]
D. kentuckyensis[3]
  • Drepanodus
D. homocurvatus[3]
D. simplex[3]
  • Eoligonodina
E. delicata[3]
  • Hadrognathus
H. staurognathoides[3]
  • Hindeodella
H. equidentata[3]
  • Keislognathus
K. gracilis[3]
  • Ligonodina
L. egregia[3]
L. silurica[3]
  • Neoprioniodus
N. bicurvatoides[3]
N. planus[3]
  • Oistodus
O. venustus[3]
O. gaertneri[3]
O. tenuis[3]
  • Paltodus
P. multicostatus[3]
P. trigonius[3]
P. gracilis[3]
P. miseri[3]
P. simplex[3]
P. sulcatus[3]
P. unicostatus[3]
  • Phragmodus
P. undatus[3]
  • Plectospathodus
P. extensus[3]
  • Prioniodina
P. irregularis[3]
S. insculptus[3]
S. manganiferus[3]
S. procerus[3]
S. sweeti[3]
S. wolfordi[3]
  • Tetraprioniodus
T. superbus[3]
  • Trichonodella
T. brassfieldensis[3]
T. carinata[3]
T. diminuta[3]
T. exacta[3]
T. variflexa[3]
  • Zygognathus
Z. mira[3]

See also

  • iconPaleontology portal

References

  1. ^ a b McFarland, John David (2004) [1998]. "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36: 7. Archived from the original (PDF) on 2016-12-21. Retrieved 2018-01-11.
  2. ^ a b Williams, Henry S. (1894). "On the age of the manganese beds of the Batesville region of Arkansas". The American Journal of Science. 3rd Series. 48: 325–331.
  3. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax Craig, William (1968). The stratigraphy and conodont paleontology of Ordovician and Silurian strata, Batesville district, Independence and Izard counties, Arkansas (PhD). The University of Texas.
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