STRATIGRAPHICAL ORDER. 103 
that the Baird ore of Perry county is the Limestone ore of the Hanging 
Rock district. Since that volume was published, there has been great 
activity in tracing and developing the various coal, ore, and limestone 
horizons of the Lower Coal Measures through Perry, Hocking and Vin- 
ton counties, an activity stimulated by the demands of the new furnaces 
of the Hocking Valley for these various elements of iron manufacture. 
The demonstration referred to above has entered into many of these 
schemes of discovery and development. If there were error or uncer- 
tainty involved, it would necessarily have been made apparent in the 
course of these investigations, but not only does the original line of sec- 
tions on which this demonstration was established stand unimpugned, 
but a great number of new and independent facts have been brought 
out which leave this identity as well settled as any point of like char- 
acter in Ohio Geology. 
Two or three skeleton sections will be given to illustrate the steadi- 
ness of the elements that we have been following as they occur in this 
new field. On the farm of Thos. 8. Mains, section 7, Pike township, 
the following elements were seen in the relations indicated : 
Ft. In 
COM MONG Ikatiinrarmtaye (NI@s (@)) a0050000086040600en00000000060G00001900000000 3. 6 
inte rvaleeceenes secret vectsa tes seee tacks celNecscotseoeate dae osestescdeddeaes 26 
Coal ower kKattanminoy (NOS D)eceseessis cesta ccd nsceecsessevesserscseess if 
(Olle I Loon JEGhA TTT ONES, TALOUNHS) 160000000000000000 000005 60000 000000 56000008 6 
na bervalleen suse tisectinw s ohcean ban suiteeseeueree Setees TORBOCO DBS OC EN OODECOSTOCECH ACC 70 
Flint—Upper Mercer............cccscsesesesesees MaesdsScncacese cess yeusosesdecaas 2 
tra ervallanesseee sce rccten maser atc MR ee ca ck CML eek astute oe wes teuveneseee 5 
Comoros Mierreere (D) tO 8 S1EL) 300000000850 000060 00000000003800000000008000000 3 
tn Geral Ceres sere nace sce eco ae nee Sie cee GisicaeSeaues elles davagevaodeesse 25 
TI’imestone—Lower Mercer, bearing block Ore .............c1ssseceeesceeees 2 
Coal—Lower Mercer, thin. 
UGE tayeh lone eases eens sects oeMaCe  e Cees een ined saceeb ecto tate baakleces 14 
GiB AIIOGR, UwinGurer OMB C1.co000sc0000 290000800800006 060000405005000000000 1 
At McCuneville precisely the same range is well shown, and here 
we find the measurements as follows: 
Ft. In 
Com-Nibielolle Uahienrmbays (ANI, ©))ccoce: coon0000, Ga000 bo0b0N996c3E6H600N0EG0E060 4 6 
JIT KET El dconbecheas Saenceaconed COREE ao: HOCECRORCCC EA RRS nent ene Eee ner ate 30 
Coal Movers eit carmmingen (NOD) sseceeeectnc creer oeercecccesceneete cece cos: 1 
linterna ostlyawlaitenclayasweeececetereter cee ccccceee coerce etc scceee 15 
Ore and flint—Ferriferous limestone, Baird Ore............00.sseseeeeees | 
JEST ojscGoddo cCACO CAL EO ASOE GRAN Nea RAILCAR A A a 18 
