310 



COUNTY AND EEGIONAL GEOLOGY. 



Fig. 15. 



Section at Clarke's. 



No. 6. Sandy shales 32 feet. 



No. 5. Bluish, impure, shaly limestone, sometimes compact 2 feet. 



No. 4. Black carbouaceous shale 3 feet. 



No. 3. Bluish argillaceous shale 14 feet. 



No. 2. Coal 2 feet. 



No. 1. Fire-clay 1 foot. 



Total 54 feet. 



No. 6 of this section is the same bed as No. 2 of the 

 preceding one, measured near Winterset, and is the lowest 

 member of the Upper coal-measure formation, while all the 

 other members of the section at Clarke's belong to the Middle 

 coal-measures. No. 5 of this section is the same as No. 1 of 

 the section near Winterset, and the lower member seen at 

 Clarke's, may no doubt be found at only slight depth beneath 

 the bed of Middle river, near Winterset. 



