476 SS. W. McCALLIE 
Some of the larger bowlders attain a length of three feet. They are 
usually flat, spindle-shaped, with the greater diameter near the center. 
In cross-section they are ellipsoidal, the major axis being from two 
to three times as great as the minor axis, while the lengths of the 
bowlders themselves in many instances appear to be from five to 
Fic. 3.—Schist-conglomerate, showing boulders and pebbles greatly elongated, 
Lumpkin County, Georgia. 
fifteen times their original diameters. Owing, however, to a joint 
structure of the conglomerate, developed at nearly right angles to the 
schistosity, only the less elongated bowlders are to be found entire 
in the residual clays, the longer ones being usually divided by the 
