MERRILL] METEOR CRATER OF CANYON DIABEO, ARIZONA 



471 



The yellow to red sandstone, which seems everywhere to form the 

 floor of the crater, was first struck at a depth of 820 feet. Meteoric 

 material — i. e., material reacting for nickel and iron — was first en- 

 countered at a depth of 180 feet, and continued with few exceptions 

 in all samples down to 600 feet. 



A like record of other holes is as below : 



No. 7 yielded material reacting for nickel at depths of 450-550 



595-640 

 598-660 

 540-620 

 'SQo-^oo 

 540-620 

 520-580 

 640-680 

 620-640 

 600-620 



feet. 



No. 12 

 No. 13 

 No. 14 

 No. 15 

 No. 16 

 No. 17 

 No. 20 

 No. 21 

 No. 22 

 No. 23 

 No. 24 



520-620 

 550-650 



The following table in connection with figures 124 and 125 is in- 

 structive as showing the condition of the deeper lying beds and the 

 varying depths at which what could be unmistakably identified as the 

 underlying red beds were reached: 



Hole 

 No. 



5 

 6 



7 

 8 



9 

 10 

 11 

 12 



13 

 14 

 15 

 16 



17 

 18 



19 

 20 

 21 

 22 



23 



Red beds found 

 at depths of — 



885 feet 



890 feet 



905 feet 



900 feet 



Not reached 



u t c 



830 feet 



875 feet 



Not reached 



860 feet 



Not reached 



Total depth 

 of hole. 



1,003 feet. . . . 

 1,059 feet. . . . 



960 feet 



1, 08s feet 7 in 



670 feet 



745 feet 



8}o feet 



881 feet 



740 feet 



780 feet 



750 feet 



750 feet 



720 feet 



660 feet 



680 feet 



7S0 feet 



760 feet 



860 feet 



800 feet 



Remarks. 



Solid cores obtained below 1,030 feet. 

 Solid cores obtained below 1,030 feet. 



Solid rock below 640 feet. 



" 640 feet. 



" " " 700 feet. 



" " " 640 feet. 



" " " 670 feet. 



" " " 650 feet. 



' ' 640 feet. 



" 600 feet. 



" 630 feet. 



" " " 620 feet. 



" " " 720 feet. 



" 660 feet. 



" " " 650 feet. 



" 660 feet. 



These records are sufficiently characteristic to serve our purpose. 

 It is evident that the bottom of the crater was occupied at one time 

 by a shallow lake, in which lived diatoms and fresh-water mollusks, 



'Traces only. 



