420 W. M. DAVIS AND S. W. LOPER FOSSILIFEROUS TRIASSIC SHALE. 



Standing on one of its summits, such as Chauncey peak or Higby mountain, 

 three miles northeast of Meriden, one may see the crest-liues of the main 

 ridge in the various blocks toward the northwest and southeast, all reaching 

 about the same height, and this common height closely like that of the re- 

 markably even sky-line of the crystalline plateau by which the Triassic low- 

 land valley is enclosed on the east and west. The gradual descent of the 

 highland to the south is also apparent from this point of view. Another 

 notable feature seen at the same time is Mount Carmel, apparently in the 

 same block with Higby, but some ten miles toward the southwest, rising 

 somewhat above the sky-line of the crystalline highland, and, therefore, 

 to be regarded as having been a low hill on the old peneplain in Creta- 

 ceous time. 



via ui 7 >• 

 CRE-T/\CE.OUS-> ft'^saj U 



K» LOST VOl-C/^NOCS 



i^y CARr^fL. 



Figure 2 — A Portion of the Triassic Formation, after tilting into the monoclinal Attitude and deep 



Erosion. 



The volcanic cones inferred to have been formed where the lavas rose to the surface and supplied 

 the overflows are now all destroyed, and Mount Carmel is supposed stand beneath their ancient 

 site, where the feeding dikes now outcrop. No faults are shown in this figure, because the section 

 line is supposed to run between the enclosing faults of a single block; and no cross-faults are yet 

 known. 



It has been stated above that as Mount Carmel is composed of numerous 

 dikes, many of large size, it may be regarded as the locus of the volcanic 

 pipes up through which rose the lavas now seen in the extrusive and intru- 

 sive sheets. No direct evidence of this correlation can be obtained at present ; 

 for the intrusive sheet near the base of the formation would intersect the 

 Mount Carmel dikes below the actual surface of the country, and the ex- 

 trusive sheets would rise far above Mount Carmel, if prolonged in its direc- 



