340 CONNECTION OF TIIEK.MAL SPRINGS IN VIRGINIA 



ern base of the Litllc North Mountain, all comprised in a distance 

 which, in a direct line, is less than six miles. 



On comparing the two Sections it will be seen, that the anticli- 

 nal valley of the Paddy and Great North mountains contracts 

 towards the northeast, the inversion on its northwestern side being 

 at the same time replaced by steep northwestern dips. This change 

 goes on augmenting, until, at no great distance northeast of the 

 present section, the valley terminates in a great anticlinal moun- 

 tain of normal flexure, formed by the now united rocks of the 

 Paddy and Great North mountains. While this change is in 

 progress, two small axes, commencing a little northeastwards of 

 Section IX, make their appearance in the Cedar Creek Valley, 

 lifting For. VII and then VI, from beneath the slate, and form- 

 ing the low range called the Sugar Hills. It is in the more 

 important of these axes, that the Bon Springs are situated. This 

 is a sharp anticlinal, giving exit to the water through For. VI. 

 The spring to the east of this flows from the limestone near the 

 southeastern base of the Xiittle North Mountain, issuing as before 

 noticed from a line of inversion and fault. Pearce's thermal 

 agrees in position, as regards the axis, with the Cacapon Springs, 

 rising near the junction of steep-dipping VI and VII. 



All these springs evolve more or less gas, chiefly nitrogen, and 

 the Bon Springs contain a considerable amount of calcareous 

 and magnesian salts. 



Deeming the preceding details sufficient to illustrate the condi- 

 tions under which the various classes of thermals in Virginia 

 present themselves, it would be unnecessary, as well as tiresome, 

 to enumerate similar particulars in regard to the numerous other 

 w^arm springs referred to in the preceding tables. I may here, 

 however, remark, that but few of our thcrmals, not flowing in 

 axes, rise, as in the case of the Mill Mountain and Keyser's Springs, 

 on the southeastern side of the axis-plane. Indeed, out of the 

 whole number included in the tables, I know of but three groups 

 so situated, and these are exhibited on the Sections. All the others 

 issue from the sterp-dipping- on inverted strata on the northicest 

 side of the anticlinals, and this may be laid down as the general 

 law of their position. 



