This paper discusses the folding, in Carboniferous time, which resulted in the Ouachita, Arbuckle, and Wichita Mountains and the Llano-Burnet and Marathon uplifts (see figure 2). A new name, the Oklahoma Mountains; is introduced to designate all these ranges.3 The Ozark Mountains are not included because they are essentially a part of a broad dome that extends from southeastern Missouri far west into Oklahoma, and that has undergone, uniformly, throughout its extent, broad periodic tilting and gentle folding unlike the sharp folding of the mountain masses on the south. Llanoris4 is discussed because of its bearing on the folding of the adjacent mountains.
Only the movements in Carboniferous time are considered. Earlier movements in southern Oklahoma, except, possibly, an upwarp of the western part of the Wichita Mountains, were of minor effect. In the Arbuckle Mountains the top of the Hunton limestone is in places missing and its . . .