166 



BRANNER— THE FLUTING AND PITTING 



[April 4, 



when isolated, and they reach a diameter of two meters or more, 

 though they are generally not so wide. The fluting sometimes has 

 the appearance of originating in these caldrons, but this seems to be 

 due to the water overflowing and cutting notches in the rims on one 

 side and thus merging the pits and the fluting into each other. In 

 some cases I have seen a series of these pits in a nearly vertical row 





Fig. I. Composite sections down the pitted and fluted rock surfaces at 

 and about Quixada showing the general forms of the caldrons. 



and connected by a furrow that gives the whole the appearance of a 

 great irregular staircase mounting the hill (Fig. i). 



These caldrons are very abundant in some of the rocks, while in 

 others they do not appear at all. They occur on the tops of moun- 

 tains, hills, or bosses, on the sides and at the bases ; they are mostly 



