798 GEOLOGY OF OHIO. 



Lowell Limestone is identical with that on the Goodman farm at Green' 

 since the connection is severed by valleys and obscured by Drift. The 

 Lowell Limestone is thicker than the White Limestone is any where 

 known to be, and it contains some fossils which I have never found in 

 the latter; but the Lowell Limestone lies ninety feet above the limestone 

 next below it, and more than one hundred and fifty feet above Coal No. 

 3 ; it also lies nearly three hundred feet above the level of Coal No. 1, at 

 its nearest outcrop at Nebo; so that if the Lowell Limestone is the 

 equivalent of the Ferriferous, and not of the Freeport Limestone, we 

 have here an immense local thickening of the Lower Coal Group. It is 

 also true that we have here a bed of limestone of greater thickness than 

 any other in Northern Ohio, which has completely disappeared, or 

 dropped one hundred feet from its level, and greatly diminished in 

 dimensions in passing into the next township west. From the great 

 number of borings made in the townships west and north of Poland, we 

 learn that the limestones over Coals Nos. 3 and 3a generally lie consider- 

 ably within two hundred feet of the Block Coal, and that the limestone 

 of Greene township, which is certainly identical with the White Lime- 

 stone of Columbiana county, is not more than three hundred feet above 

 that seam. In the southwest corner of Youngstown some of the borings 

 made are said to have passed through three strata of limestone, the upper 

 one being reported to be from one hundred and eighty to two hundred 

 and sixty feet above the Block Coal. It is possible that the upper one 

 of these represents the Lowell Limestone, here diminished in thickness, 

 and that further west it disappears, the lower two limestones only being 

 found west of that township. If this should prove true we should be 

 compelled to conclude that the Lowell Limestone is not identical with 

 that on the Goodman hill, and was confined to a territory lying within 

 five or six miles of the Pennsylvania line ; also, that the Lower Coal 

 Measures thicken rapidly toward the east, and by the introduction of 

 new elements present a quite different composition from that we gener- 

 ally find in Northern Ohio. Until further exploration shall throw 

 more light on this question it must be left undecided. 



Coal No. 6. 



Unless it should prove, as does not now seem probable, that the Lowell 

 Limestone is the equivalent of the White Limestone of Columbiana 

 county, and the coal which lies above it, and is opened on the farm of 

 James Moore, is Coal No. 6, this seam cannot be reckoned as forming part 

 of the economic resources of Mahoning county. In Columbiana it is 

 from three to seven feet in thickness, and one of the most important and 



