68 GEOLOGY OF OHIO. 
proper horizon, half-way between the Putnam Hill limestone and the 
Lower Kittanning coal. The phase here presented is a common one of 
the limestone throughout the interval of its unsteady development. It 
is drab-colored, bedded and not nodular, distinctly, but not abundantly 
fossiliferous. A calcareous sandstore, effervescing freely with acids, 
but not slaking after roasting, is another common phase of this horizon. 
In No. 7 of the section, we find the best exhibition of the Tionesta 
coal of Rogers in all of this region. It is worked quite extensively here 
for the supply of the country around. In the following section we find 
a somewhat greater thickness of the seam, but its value is scarcely in- 
creased thereby. The seam has a considerable development in the 
western side of Stark county. The other elements need no comment, as 
they occur in typical form and at the usual intervals. The distance 
from the Lower Mercer limestone to the Ferriferous limestone is here 
_seen to be 110 feet, or a little less than the distance in Mahoning county 
where we left its last exposure (120 feet). The dip from Bolivar to the 
tunnel section is about 80 feet, the course that we have followed leading 
up the line of rise. 
Two miles northwest of Bolivar on the Joseph Hair farm and near 
the Fire-clay Works of B. M. Allison & Co., a section taking in nearly 
the same range as the last is shown. It is as follows: 
Kt; In 
Ik, Gran) ip LEO aHTO LEMS USTOGSIOTEGs0008600200000080000000000008.900000006 00000000 2 
QP CONCEALEE. 05.) cacev od ou ince sass ouiemelosear ee MECH S aaae ae Anne Senet 25 
Coal, 1 ft. 8 in. 
3. | sist 9 in. | tionesta (Gao 310) serra ccanaoncnesnncodsondos: ecosde ri 
Coal, 2 ft. 4 in. 
APPA ONCCALC Ui Se Nees ec cna cece cette ddiccedee oe aetocee or acest a nentee mace eee Eee 15 
D, LDR WIE VOOM, Wy doer MIGIEER obs coocccce 660000000000080000000000080 3 
6.) Coal thins4 tOvGi lites. sc cascncsonseestedeuesesnaeecadooeeacmececcmeceee anes 0 6 
Te FCONCCAICAK se seewsevoatie vide sncdesosenssanscedeansueo uncon denen teatime cece 30 
SeeBiuellimesione lower Mercer ...cccscdcccscccererasecccenenceeeneeteenecee 4 
Dim Darkishaletieavccscccsceteracsctesdsocs sonics sas's'sislawslonnonseisnastlecsinwacatnes 2 
LOR [Coals thin reiti.. hc: tesiscasascccssaweatnceciedenes acesnecin acest seen eens — 
1. eDarkishall ewes eee. ce vce sec Sewers seh vans geek oom eee veces sane come sceeeeneees 2 
12s Winecl aye ssetiecctiess tetkae tec cceevssdaras Gacsiswanci qnee voters eskeeesescste cece 6 
13%. (Conceal ede wack. Ree esscnceeseschenceose ss vevesewcesne tens ooumanieneneeeeeceee 20 
14. Blue limestone (gccurs occasionally at this horizon).............. 1 6 
1H:* Concealed torcanmal ariiereresscel eek been costco cere ceteaeeneneceeeeneanes 15 
The Sharon coal is found in basins near the point which we have 
now reached at a depth ranging from 125 to 180 feet below the Lower 
Mercer limestone. 
