Bul. 211, U. S. Dept. of Agriculture. PLATE |. 
FIG. 1.—VIEW IN THE NORTHEASTERN PART OF NEW MExiIco, SHOWING THE TOPOG- 
RAPHY AS AFFECTED BY LAVA SHEETS. 
Fic. 2.—A TypPicAL BOLSON, OR BASINLIKE MESA, IN THE SOUTHERN PART OF NEW 
Mexico, SHOWING THE SHRUBBY ASSOCIATION ON THE GRAVELLY PORTIONS OF 
SUCH AN AREA. 
