Cason Shale

The Cason Shale is a Late Ordovician to Middle Silurian geologic formation in the Ozark Plateaus of Arkansas. The name was introduced in 1894 by Henry Shaler Williams in his study of Arkansas. 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

Acodus A. inornatus A. unicostatus Ambalodus A. triangularis Amorphognatus Belodella B. flexa Belodina B. inclinata B. ornata Carniodus Cordylodus C. delicatus C. flexuosus Distacodus D. mehli D. posterocostatus D. procerus

Distomodus D. kentuckyensis Drepanodus D. homocurvatus D. simplex Eoligonodina E. delicata Hadrognathus H. staurognathoides Hindeodella H. equidentata Keislognathus K. gracilis Ligonodina L. egregia L. silurica Neoprioniodus N. bicurvatoides N. planus

Oistodus O. venustus Ozarkodina O. gaertneri O. tenuis Paltodus P. multicostatus P. trigonius Panderodus P. gracilis P. miseri P. simplex P. sulcatus P. unicostatus Phragmodus P. undatus Plectospathodus P. extensus Prioniodina P. irregularis

Pterospathodus Scolopodus S. insculptus Spathognathodus S. manganiferus S. procerus S. sweeti S. wolfordi Tetraprioniodus T. superbus Trichonodella T. brassfieldensis T. carinata T. diminuta T. exacta T. variflexa Zygognathus Z. mira

See also

List of fossiliferous stratigraphic units in Arkansas Paleontology in Arkansas

References