324 



COUNTY AND EEGIONAL GEOLOGY. 



Several interesting exposures occur in the valley of Elk 



Fig. 20. creek, a western tributary of Grand 



f uj^j^Jl^zJ^-4 *' r i ver > and in those of both its princi 



£jjsjgj=gg2^^\ pal branches. The accompanying 



*jSljjjjj|§Ei|Sl /a . section, (Fig. 20), was measured at a 



gBSIjlllBlBijB \ point a little below the confluence 



f j BS SSSSS^i ii I' 6 " °f those branches, and on section 



J^-jj^B 1 ^-^^ ^) 5 ' 34, township 69, range 27. 



Elk Creek Section, 



No. 7. Compact limestone, (one uniform layer) 1 foot. 



No. 6. Marly clay % foot. 



No. 5. Grayish limestone. 2 feet. 



No. 4. Grayish limestone, somewhat shaly 12 feet. 



No. 3. Bluish, clayey shale 1*^ feet. 



No. 2. Black, fissile carbonaceous shale 1 foot. 



No. 1. Bluish, clayey shale 3 feet. 



Total.... 21 feet. 



Fig. 21. 



The next section was also 

 measured in the valley of the 

 south branch of Elk creek, com- 

 mencing a little above the place 

 of that just given, and adding 

 the strata to that, as they are 

 successively exposed within a 

 quarter of a mile. 



No. 9. 

 No. 8. 

 No. 7. 

 No. 6. 

 No. 5. 

 No. 4. 

 No. 3. 

 No. 2. 

 No. 1. 



Section on South Branch of Elk Creek. 



Thin bedded, bluish limestone, with shaly partings 3 feet. 



Brownish, mottled, clayey shales 2 feet. 



Black, fissile, carbonaceous shale 2}^ feet. 



Compact layer of limestone K foot- 

 Bluish, clayey shale H feet. 



Hard, gray limestone IK feet- 

 Bluish, clayey shale 1 foot. 



Hard, grayish limestone 2 feet. 



Bluish, calcareous, clayey shale 3^ feet. 



Total 27 feet. 



