|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|
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
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.|
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.
|Counties||Baxter - Independence - Izard - Lawrence - Marion - Newton - Searcy - Sharp - Stone|