Fernvale Limestone

The Fernvale Limestone is a geologic formation in Alabama, Arkansas, Illinois, Missouri, Oklahoma, and Tennessee.^[1] It preserves fossils dating back to the Ordovician period.

Fernvale Limestone
Stratigraphic range: Ordovician
Type	Formation
Underlies	Cason Shale
Overlies	Kimmswick Limestone
Thickness	0 to 100+ feet in Arkansas[1]
Lithology
Primary	Limestone
Location
Region	Arkansas, Tennessee
Country	United States
Type section
Named by	Charles Willard Hayes and Edward Oscar Ulrich[2]

Paleontology

Brachiopods

• Lepidocyclus

L. cooperi^[3]

L. oblongus^[3]

Conodonts

Acodus A. unicostatus[4] Acontiodus A. alveolaris[4] Ambalodus A. triangularis[4] Amorphognatus A. ordovicica[4] Aphelognathus A. polita[4] Belodina B. compressa[4] B. inclinata[4] B. ornata[4] B. penna[4] B. profunda[4] Cordylodus C. delicatus[4] C. flexuosus[4]

Dichognathus D. brevis[4] D. scotti[4] D. typica[4] Distacodus D. falcatus[4] Drepanodus D. homocurvatus[4] D. suberectus[4] Eoligonodina E. delicata[4] Icriodella I. superba[4] Keislognathus K. gracilis[4] Oistodus O. abundans[4] O. inclinatus[4] O. parallelus[4] O. venustus[4]

Ozarkodina O. inclinata[4] O. tenuis[4] Paltodus P. trigonius[4] Panderodus P. compressus[4] P. ellisoni[4] P. fornicalis[4] P. gracilis[4] P. homosimilaris[4] P. panderi[4] P. simplex[4] P. sulcatus[4] Phragmodus P. undatus[4] Prioniodina P. furcata[4]

Rhynchognathodus R. divaricatus[4] R. typicus[4] Sagittodontus S. robustus[4] Scolopodus S. insculptus[4] Trichonodella T. exacta[4] T. diminuta[4] T. tenuis[4] Zygognathus Z. curvata[4] Z. mira[4]

See also

• Earth sciences portal
• United States portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Arkansas
• List of fossiliferous stratigraphic units in Tennessee
• Paleontology in Arkansas
• Paleontology in Tennessee