U. §S. GEOLOGICAL SURVEY BULLETIN 611 PLATE IV 
A, BADLANDS IN THE VICINITY OF MANDAN, N. DAK. 
These are not so rugged or picturesque as those to be seen farther west, where the precipitation is less. 
B. CRACKS PRODUCED BY THE BURNING OF A BED OF LIGNITE.: 
Where a bed of lignite man y f 
hick burns, the sandstone or shale overlying it breaks down, forming large 
cracks thease ‘whieh steam and smoke issue as long as <a lignite is on fire. 
