932 GEOLOGY OF OHIO. 
where it has been used. It seems to be the same seam that is known in 
this part of the district as the “ Little Yellow Kidney.” If not iden- 
tical with it, both belong very near together. 
The ledge of sandstone that comes next in the section isa marked 
and characteristic element in the geology of the region. It is a Con-— 
glomerate, the first well defined rock of this kind that has been found 
in the three or four hundred feet of strata that are now being reviewed. 
It contains quartz pebbles, for the most part, but occasionally coarse 
pebbles of non-fossiliferous limestone and of Coal Measure sandstones oc- 
cupy the series for several feet of thickness. This phase is well shown at 
Buzzard’s Roost, on the old road leading from Ironton to Hecla Furnace. 
The limestone pebbles seem to be derived from the Buff Limestone last 
named. This Conglomerate stratum is found tobe an excellent and reliable 
guide throughout the southern and eastern portions of Lawrence county. 
At about one'hundred feet above Coal No. VI another coal seam is 
shown in this same hill. The measurement was not in this instance, 
however, direct, and the distance may be somewhat less than has been 
given. The coal is worked on the furnace lands. It is four feet thick 
and of fair quality. 
A barren reach of eighty-seven feet—mainly sandstone, intervenes be- © 
tween this coal seam and the Cambridge Limestone. This wel! marked 
stratum is frequently found in two courses from one to twenty feet apart. 
It seems to be so divided here. At one hundred and sixty-seven fee 
the lower stratum seems tobe met. Seventeen feet higher the main 
layer is found, at a height of one hundred and eighty-four feet above 
the Sheridan coal. This limestone completes the section. 
On comparing this section with the one measured in the Hocking 
Valley—page 926, a remarkable agreement will be observed. The bound- 
aries of the Meeker’s Rum and Monitor Furnace sections are certainly 
the same. Both the coal and the limestone that constitute these bound- 
aries have been followed from township to township, through the whole 
district, until the identity of each throughout its various exposures has 
been completely established. The interval in the first section between 
these two horizons is one hundred and seventy feet; in the second, it is 
one hundred and eighty-four feet. But it was remarked that the interval 
in the Meeker’s Run section was ten or fifteen feet shorter than the 
usual interval. In other words the usual interval between these horizons 
in the Hocking Valley is exactly the same that we find in the Ohio 
Valley. This agreement is certainly surprising. As has been already 
remarked such identity of measure in sections so remote from each other 
would constitute proof of difference rather than of equality of age, but 
here we are obliged to believe that the same number of feet of strati- 
