The base on which the salt was deposited is a finely layered calcareous clay which had acquired some measure of cohesion before deposition has ceased. On the incursion of saline water, there was sufficient bottom current action to break and upset the bedded clay and lift up slabs of 2 or more feet in length and 3-5 in. thick into the accumulating salt. Smaller fragments were progressively broken up and rolled to higher stratigraphic position. Once caught in place, the balls became buried in salt which in its granular growth impressed the form of their crystal faces upon the shale as the only noticeable modification of an otherwise perfect spherical form. The internal form of the clay balls remains the same as when the material was originally deposited.