Stevenson.] ^^^ [Oct. 7, 



The bluff immediately north from the shaft at Rockvale affords good ex- 

 posures of the overlying beds. The section obtained on this blufi is as 

 follows : 



1. Sandstone 20' 



This is buff, soft, weathering with honeycombed 

 surface, but contains a hard reddish band, only a 

 few inches thick. 



3. Sandstone 45' 



Very like the last, but containing some shale, 

 which decreases westward until both sandstones 

 are practically one. 



3. Coal bed M Blossom. 



This may be only a carbonaceous shale. 



4. Shales and sandstone 61' 



Where the section was taken this seems to be 

 almost wholly variegated shale, but within 50 

 yards it has a bed of massive sandstone, buff or 

 yellow, soft and covered with a thin band of 

 hard red sandstone. 



5. Sandstone 8' 



Yellow, where examined, more or less ferrugin- 

 ous, with small nodules of carbonate of iron ; at 

 a little distance further up the creek, it becomes 

 buff like the higher beds and weathers into 

 rounded bosses. This is a marked and persistent 

 bed, which remains above the surface to the bot- 

 tom of the synclinal at the forks of the creek. It 

 has on top a thin bed of flaggy red sandstone, 

 which is very hard. 



6. Shale 87' 



Variegated, with some thin beds of sandstone, 1' 

 to 2' thick, which are more or less argillaceous ; 

 here and there is a band of carbonaceous shale ; 

 possibly some coal may belong in this interval 

 but none was recognized. 



7. Sandstone 9' 



Very like No. 5. 



8. Shales 186' 



Variegated ; for the most part well exposed, but 

 the exposure is incomplete toward the base, 

 where two black streaks were seen, the blossoms 

 of Goal beds K and L. This mass is persistent. 

 It passes below the surface before the synclinal 

 axis is reached, but re-appears on the west side in 

 in the bluff at the head of Oak creek canon. 



9. Sandstone 35' 



Hardly differing in general features from No. 5. 



