1881.] ^^^ rstevenson. 



10. Variegated shales 30' 



11. Coal bed J 0' 10' 



Represented only by carbonaceous shale, where 

 the section was measured ; but it has- been open- 

 ed elsewhere on the bluflf, with a thickness of 1'. 



12. Shale 24' 



At the base of this is a very friable sandstone, 

 almost white, which is persistent. 



13. Concealed 25' 



This is calculated from the dip as the interval be- 

 tween the base of No. 12 and the top of the sand- 

 stone in which the shaft begins. Exposures in 

 the vicinity indicate that this is occupied in part 

 at least by shales at the base of which is Coal bed 

 I. That bed is not exposed here. 



This blufi is continuous to the canon of Chandler creek, and the same 

 section is exposed at the mouth of that canon. The sandstones of the sec- 

 tion are all light yellow or buff, and almost without exception have a band 

 of hard red flaggy sandstone as the top layer. Search was made in all 

 these red beds, but no fossils were found aside from the Halymenites, and 

 that has its upper limit in the great sandstone at the top of the shaft. Oc- 

 casional impressions of fossil dicotyledonous leaves were seen, and a fine 

 Sabal has been brought out of the shaft No. 1. The dip here is somewhat 

 more than 3 degrees and almost due west. 



South Oak creek enters the main stream at Rockvale and flows north- 

 wardly. The great sandstone with Halymenites continues in sight along 

 this stream for nearly two miles. At the first fork of the stream the top 

 of that rock is reached, and there Goal bed I is well exposed, with the fol- 

 lowing structure : 



1. Coal 8^" 



2. Clay i"to 1" 



3. Coal 9i" 



4. Sandy clay V to 1^" 



5. Coaly shs.le 2" to 4" 



6. Coal 11" to 13" 



Total 2' 11" 



The coal is evidently poor throughout. The bed is overlaid with shales 

 succeeded by the friable white sandstone seen near Rockvale. Streaks of 

 coal are shown in the shale at a little way further up the creek. At say a 

 mile further up the main stream its canon and that of a gulch leading into 

 Bluft' Spring park, a tributary to Coal creek, come very closely together. 

 There the shales, No. 8 of the Rockvale bluff, are reached, but no expo- 

 sure of Coal beds K and L was found. 



Following up Oak creek above Rockvale, one sees the rocks descending, 

 until the sandstone, No. 5 of the Rockvale section, is the lowest bed ex- 



