STRETCHED PEBBLES FROM OCOEE CONGLOMERATE 59 



Microscopic examination of thin sections of the pebbles shows 

 that they are made up of interlocking quartz granules containing 

 numerous small inclusions. Some of the granules exhibit a banded 

 appearance somewhat like, but different from, plagioclase feldspar. 

 It has been suggested that these bands are possibly due to striae 

 made by grinding; but this explanation hardly seems plausible, as 

 such irregular surfaces would probably be rendered invisible by the 

 Canada balsam. In sections tranverse to the long axis^pf the pebbles 

 the granules are elongated; but in sections parallel to the long 

 axis, and in the short axis of the ellipse formed by the cross-section, 

 as well as in sections parallel to the long axis, and in the long axis 

 of the elhpse formed by the transverse section, the elongation of the 

 granules is not so pronounced. The degree of elongation of the indi- 

 vidual granules in the tranverse section is about sufficient to 

 account for the flattening of the pebbles in that direction. The 

 mechanical effect of strain or stress shown by wavy extinction was 

 not observed in any of the sections. 



