ROSS COUNTY. 657 



No advantageous station has been found in a due east and west line, 

 but some approximate calculations on such a line gave about the same 

 figures as the last line yielded. 



The next line extends from Samantha to Piketon, in a direction 22° 

 south of east. Still another line is seen bearing east 26° south, and ter- 

 minating at Jasper. These lines run so near together that they give sub- 

 stantially the same results. The first one yields a dip of twenty-six feet, 

 and the second of twenty-five and one-half feet to the mile, assuming, as 

 before, the total thickness of the Huron shales to be three hundred feet- 

 If this element is increased to its maximum, the dip will be increased by 

 one foot in each instance. 



Finally, a line is drawn from the initial station to Byington, passing 

 through Slate Knob, in Highland county. From Samantha to Slate 

 Knob the face of the limestone descends at an average of sixteen feet to 

 the mile, while from the latter point to Byington the descent is more 

 than twice as rapid, being not less than thirty-four feet to the mile. For 

 the whole distance the average fall is twenty-four feet. 



Various other combinations will be suggested to those who take an in- 

 terest in such questions. 



The facts enumerated above can be shown, perhaps, more clearly in 

 tabulated statements. 



The dip in a direction 



East 32° north, for a distance of 14$ miles, is 14} feet to the mile. 



East 9° north, " 33$ 



East 22° south, " 36J- 



East 26° south, " 34} 



East 40° south, " 12 } 



East 40° south, " 9J 



East 39° south, " 21| 



24} to 25} feet to the mile. 



26 to 27 



25} to 26}' " 



16 



34 



24 



The following points will be noted : 



1. The dip of the rocks is to the south of east. The greatest dip found 

 along the main lines above given is in a direction 22° south of east, and 

 is twenty-six to twenty-seven feet to the mile. There is some reason for 

 believing that a line 17° or 18° south of east would be a nearer approxi- 

 mation to the line of greatest dip; but in default of other figures, the 

 direction and amount given in this paragraph may be taken as the best 

 statement that there is warrant for making at present. 



2 There is great regularity in the inclination of the strata in this 

 district. West of the Highland county line the amount is considerably 

 less than to the eastward. The most signal deviation from the general 



42 



