Mk HOPKINS, ON RESEARCHES IN PHYSICAI, GEOLOGY. 51 



verse, thus producing systems of longitudincd and transverse faults 

 such as described in tlie Introduction, (i. ., /3.) "^ 



51 Sections of longitudinal faults which may be thus produced 

 are shewn n. the annexed diagram, which represents one of the form^ 

 whxch It IS manifest, the uplifted mass represented in page 45, may 

 ultimately assume from the causes above mentioned (Art. 5ot In such 

 case we shall have an anticlinal line through A-. running parallel to 

 the genera one through C in the central part of the elevation; and 

 a synclinal line through A^' parallel to the two former ones The 

 existence also of these longitudinal fissures and consequent irregulari- 

 ties of surface, will obviously tend to direct the action of superficial 



agents of denudation along longitudinal courses, and thus to facilitate 

 the formation of longitudinal valleys, particularly in the case in which 

 the relative elevation of two adjoining portions of the mass is such 

 as represented at N. If this kind of elevation be continued for a 

 considerable distance longitudinally, a distinct longitudinal valley must 

 be the necessary consequence. 



52. It not unfrequently happens that we observe in anticlinal lines 

 a degree of deviation from approximate rectilinearity, which might at 

 first sight appear inconsistent with the mode of formation which this 

 theory would assign to them, assuming that great predominance of 

 general over partial and accidental causes, throughout an extensive area 

 with which very irregular deviations in the direction of a fissure would 

 not be accordant. It seems, however, highly probable, that this cha- 

 racter of anticlinal lines would not, in fact, be the unfrequent conse- 

 quence of the general causes we are considering. In the first place 

 we may observe that longitudinal fissures are not necessarily continu- 

 ous for any great distance, as we have explained in Art. 33, and 



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