MERRILL] 



METEOR CRATER OF CANYON DIABLO, ARIZONA 



469 



somewhat indistinctly at the point directly beneath the arrow in 

 fig. 2, pi. LXV. 



The "typical North Cliff" section (Station 28) shows again a thin 

 bed of red sandstone underlying the surface debris, dipping outward 

 at an angle of 36 , under which is the yellow limestone lying nearly 

 at the same angle, and beneath this again the white sandstone. The 

 slope of the cliff facing the crater is here 49 ° to 6o°. The "typical 

 South Cliff" (Station 14) shows likewise the red sandstone and 

 yellow limestone dipping at angles of 12 to 14 , with the angle of 

 slope of the interior wall standing as high as y6°. A very little white 

 sandstone shows through the top of the talus beneath the limestone. 



These examples are sufficient to convey an idea of the remarkable 

 character of the crater walls. The following table from Mr. Tilgh- 

 man's notes is, however, inserted (compare fig. 125) : 



