WELLS FORMATION--Gray limestone interbedded with yellow limy sandstone.  P&Ma, P&M
HARTVILLE FORMATION--Red and white sandstone underlain by gray dolomite and
     limestone, red shale, and red and gray sandstone.  Lowermost unit may be Late Mississip-
     pian in age.  P&h
MINNELUSA FORMATION--Buff and red limy sandstone; some thin limestone beds, solution 
     breccias, and gypsum.  P&m, Pzr