PHILOSOPHICAL SOCIETY, UNIVERSITY OF VIRGINIA 



Fig. 1. MicROPHOTOGRAPH OF Zircon Separated from Sandstone Obtained 

 Three Miles West of Ashland, Virginia. 



Passed through a 150-mesh sieve. Rounding of the grains from wear is shown but 

 in many cases the original crystal outline can be seen. Magnified 97 diameters. 





^d®^ 



Fig. 2. Microphotograph of Zircon Separated from Sandstone Obtained 

 Three Miles West of Ashland, Virginia. 



Passed through an SO-mesh sieve and caught on a 100-mesh sieve. Rounding of the 

 grains from wear is pronounced. Large prismatic grain to right of center is cyanite. 

 Magnified 97 diameters. 



