SUPPLEMENTAL REPORT—HANaiNG ROCK DISTRICT, 921 



Measures it ha^beea opened at many points for local use, on account of 

 the scarcity of coal at this horizon. 



15. The seam next to be named is the most valuable of the Appala- 

 chian coal field, viz., the Pittsburgh Coal,ovl^o. VIII of Newberry's classifi- 

 cation. It lies at the oase of the upper productive Coal Measures, and 

 only reaches this district in isolated outliers. Its position is abDut four 

 hundred and forty feet above Coal No. VI, though the maxmium intervals 

 measured give over five hundred feet. No discussion of the seam is in 

 place at this time. 



The formal enumeration of the extendsd coal seams of the district has 

 now been completed. The number given is large, but it is in no wise in 

 excess of the facts. Several additions could be made, indeed, of seams 

 that have a considerable distribution, but none has been discussed here 

 that can not be traced through more than a single county. 



It will be seen that there are many points in regard to which uncer- 

 tainty prevails. Attention is called to them in order that the facts 

 maybe noted by these who have the opportunity. It is only by connec- 

 ting the several subdivisions of the fi dd, on the basis of a minute and 

 individual knowledge of each one that is possible to none but actual 

 residents, that the facts can be combined in the truth ot nature. 



D. GENERAL SECTION. 



A general section to which reference has already been repeatedly made, 

 is here introduced, showing the order of succession of all the elements 

 thus far described. It will be seen that the absolute elevations above the 

 Jackson Shaft Coal are generally put at a higher figure here than in the 

 preceding diagrams. This arises from the fact that maximum intervals 

 mu.'-t be used in the general section in order to find the proper rojm for 

 all the elements. No interval between conspicuous horizons, however, is 

 introduced that is not guaranteed by some actual and carefully measured 

 section. 



The interval between the Gray Limestone and Coal No. VI is put in the 

 diagram at sixty-five feet. This is a true measure for a wide scope of 

 country, viz , Southern Jackson, Gallia, and Lawrence counties, but 

 from the middle of Jackson county northward but little more than half 

 of it is required. 



By an oversight in reading proof, the elevation of Bayley's Run Coal 

 (No. VII) is given as five hundred and ten feet, where it was designed to 

 read five hundred and twenty feet. 



The elevation given to the Iron Point Ore is the maximum elevation 

 above Coil No. VI. As a rule, the ore and Coal No. VII lies nearer each 

 other than the measures here given would imply. 



