44 GEOLOGY OF OHIO. 



ter of Harrison county. The summit of its low arch lies one to two miles 

 due east of the court house in Cadiz. The general fact of an uplift at 

 this point was noted as far back as 1874 by Prof. J. J. Stevenson, who 

 refers to it in his report upon the geology of Harrison county, Volume 

 III, page 201. It has been traced through two townships to the northward 

 of Cadiz; its extension southward is probably indicated either by the 

 Barnesville gas field, which lies about two miles northwest of the village, 

 or by the low arch that was found by the work of the Survey in the sec- 

 tion already named along the line of the Baltimore and Ohio railroad, a 

 mile east of the railway station at Quaker City. If the latter identification 

 is true, it would be to this arch that the short lived gas production of the 

 last named town is due. The former reference seems, however, the more 

 probable. 



A slight change in the direction of either this line of elevation, or 

 Hie one last named, viz., the Salisbury axis, would reach and explain the 

 well known oil field of Macksburg. Though at no time a great oil field, 

 Macksburg has been of considerable economic importance at times dur- 

 ing its development, while in scientific interest, it is not inferior to any oil 

 field of the country. It was here that the "terrace structure" as con- 

 nected with oil accumulation was worked out by F. W. Minshall, Esq., and 

 the verification of his discovery by the detailed work of the Ohio Geolog- 

 ical Survey, makes a contribution of great significance and value to the 

 geology of petroleum. If still continued southward, this line would cross 

 the Muskingum Valley near Lowell. * 



The Cambridge Anticline. 



The next arch or fold to be noted, is like the one last named, though, 

 feeble, %till distinctly traceable. It was first recognized by Prof. J. J. 

 Stevenson in his report on the geology of Guernsey county, Geology of 

 Ohio, Volume III, page 220. As determined by the instrumental work of 

 the Survey, the summit of the Cambridge arch, lies very near the western 

 boundary of the corporation limits ; but the developments of the drill 

 seem to place the axis a mile or so further eastward. As to its extension, 

 the uncertainty already confessed in regard to the axes previously named 

 exists. From the occurence of gas and oil near McConnelsville, a slight 

 relief in the rock formations must occur at that point. If Cambridge and 

 McConnelsville are joined by a straight line, this line would be in fair ac- 

 cord with the facts previously indicated in this section. 



The recent oil production of Corning, in the southeastern corner of 

 Perry county, must be explained by some low fold of the strata in this 

 territory, and this fold may be designated as the Corning axis, but there 

 are not facts enough at hand to determine its exact location or its exten- 

 sion. 



