108 | GEOLOGY OF OHIO. 
Ft. In 
Ames or Crinoidal Limestone................scecscsccccscececccscrceerseess 5 
VERSA (SPs THO) TPA) \ocedcs30060000000000000800000008800000000000000300000600600 120 
Cambridge slimeston ess. fol yoans octets Sees ea Seen nate conccttactenes 3 
Interval:(40! (05%) ivses5 dis. soseetevassaseatoreeen. Ghee eee ener 45 
Leia ute) a COrgevel:¢ COlor ESN a\y 7 kjog550000085000000020000009 9UBE00000 0600600000 00000 0a 2. 6 
INGERVALECBSy CO AD ee Loci codes voce tscoees Se scicee ceases teeceueessas@eccseeeses 40 
Upper Freeport coal—Happy Hollow Seam—(( to 6/)...........006 6 
Pire=clay, cand) Shal Gree. cstvossssiecwoscae-tsecsscccsuonsseseoenseece cece cenaets 12 
Buchtel Ore and impure Limestone.......60 s,s 60 900000 BE uabonRDoHen: 5 
SHALES, cous. cccscocsseresedscscseassdenessecaseenses ssveccosoetememommenieceronens 15 
Upper Freeport Limestone—Shawnee Limestone.................... 3 
VB TT REY AEN 8526560,6650000000000080600600060000050000000000000000000000000000000000000000 18 
IE AVE LDAeLe) OxerAG CORN (151 1H) 1187)’ 546060906000060000 60000000 004 9d6000000000 2 
Monivere rReKeyaxoveth LATIVEIS{KOPV2\49q00009000000 606000000 100000006 0690009060000000500 1 
Hin terval. .sccscccascses Jotocesecsccdacctneescteesnes sovoeGodensctne ecmsinncccecsss 34 
Mid dlewKttanminp coal (NOw6)ireeseesterececereneeaeseeteeeeeeecbecceeaes 8 
The Buchtel ore and the impure limestone associated with it are 
somewhat abnormal. They occur just where in most parts of the field 
the Upper Freeport limestone is due, but the Shawnee limestone, a few 
feet below, adequately represents that stratum, though separated quite 
widely from the coal. 
We have now followed the series with which we set out as far as 
the Hocking Valley. It has been shown to be continuous as far as its 
main elements are concerned. In particular, the coal seams keep their 
horizons through almost all of the field, and so also do the limestones, 
in the main. The Putnam Hill limestone in its full development is 
limited to that portion of the field included between the eastern line of 
Perry county and the western line of Mahoning county, but it can be 
clearly and unequivocally traced on either side of these boundaries. 
But the Ferriferous limestone has now resumed its place in our sections, 
and though a little weak in northern Hocking and Perry counties, it 
becomes steady from Washington township of the latter county south- 
ward, scarcely missing a section in which it is due from this point to 
the Ohio river. 
This portion of the field was treated of at length in my report on 
the Hanging Rock district (Geol. of Ohio, vol. I11). The unification of 
the series as there established, has been fully maintained, and the sec- 
tions given in that report can, without extended description or com- 
ment, be incorporated with the review already accomplished in these 
pages, thus continuing the series to the Ohio river. 
