STRATIGRAPHICAL ORDER. Di 
limestone, and the Ferriferous limestone. There are no open questions 
as to these identifications. The Lowellville upper limestone is the Fer- 
riferous limestone of Pennsylvania, if there is any such stratum. 
White’s connected sections give a complete demonstration of the points 
involved in this identification. (Report on Lawrence county and the 
Ohio line, Q 2, pp. 215 et seq.) 
The two limestones next below have an equally clear title to the 
names by which they are respectively designated, the Upper and the 
Lower Mercer. | 
To interpret this section, there is placed by the side of it a section 
covering the same range, Fig. 1X, combined from the two diagrams 
already introduced, to illustrate the geological order of Western Penn- 
sylvania : 
Sat ane Kabhi WAX Me LON nae | 
Bulivstone — leou Qvehash tal) asles 46 
SaaS eamoocoeoosa seep Se ood 
Limestone, fervifevous______ YP SAOOIO —— 
Se eg RED LD _—_ 
Goal, Sceul Geass_._---.- Ole Ql 
Circles io ie NI) Gi ote 
Coal , Gla vane YVoGe ak Q 
Scalise eae vette a a 
Coal, piwookwn Ue | oo 82 
Puve clay Bayes Cornish oe irae ad B_-----" hess 
Cow oe Sheadlaleyne. SOM seat oes 
| nt Tionestav- BOA he) to 8 ere 
—= ex 
pons 
eae ta U pee Mevcey____.2’ G = 
Coal, Upper a _ ON = 
— 
= 
— — _} 
See containing leon Ore atlase 25 Baeaie 
Limestone , Lower Mercer. _.2 6 
Slrallee ws ain nen sui ew om. (Oeian: 
Coal, Lower Nie eel sob omnis ye Gwitt 
Lees seale = = 60/0. pee wich 
