Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)

Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)
State Arkansas
Name Cason Shale and Fernvale Limestone (Upper Ordovician) and Kimmswick Limestone, Plattin Limestone, and Joachim Dolomite (Middle Ordovician)
Geologic age Late Ordovician to Middle Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Clastic > Sandstone (Bed)
Comments Carson Shale-calcareous shale with minor phosphatic sandstone (20 ft.); Fervalle Limestone-massive fossiliferous limestone (125 ft.); Kimmswick Limestone-massive bioclastic limestone (55 ft.); Plattin Limestone-micritic limestone intercalated with limey mudstone and dolomite (250 ft.); Joachim Dolomite-dolomicrite (150 ft.). Approximatly 600 ft. maximum thickness. Summary-70% limestone, 25% shale, 5% sandstone.
References

Craig W.W, Wise, O, and McFarland, J.D. III,1984, A guidebook to the post-St. Peter Ordovician and the Silurian and Devonian rocks of north-central Arkansas: Guidebook - Arkansas Geological Commission, vol.84-1, 49 pp.

NGMDB product
Counties Baxter - Independence - Izard - Lawrence - Marion - Newton - Searcy - Sharp - Stone