«b BULL. GEOL. SOC. AM. 



VOL. 22, 1910, PL. 9 



CHECKERBOARD TOPOGRAPHY 



Repeating diapei* pattern of rectangles due to a fracture system ordered on northeast-southwest 

 and northwest-southeast lineaments. P^rom the Elizahethtown quadrangle of the Adirondacks region 

 by the U. S. Geological Survey. 



