424 W. 31. Davis — Topographic Development of the 



deciphering the structure of the district together with maps 

 and sections to illustrate the facts of observation and a detailed 

 consideration of the arguments leading to certain conclusions 

 is now in press in the Bulletin of the Museum of Comparative 

 Zoology at Cambridge. The structural problems of the region 

 afford excellent opportunity for practical instruction in geology. 

 A brief summary of the results reached is presented here. 



The small black square in figure 1 indicates the position of 

 the Meriden district in central Connecticut and in the southern 

 part of the New England Triassic area. Figure 2 is the same 



district on a larger scale. The main trap sheet, whose mono- 

 clinal ridges dominate the relief of the region, is shaded with 

 oblique lines ; the subordinate ridges formed on the anterior 

 and posterior trap sheets are indicated by lines on either side 

 of the main ridges. The chief faults of the region are drawn 

 in broken lines, and their general southwest trend is clearly 

 seen. The several enclosed spaces numbered 1 to 5 mark the 

 areas represented on maps of still larger scale in the Bulletin 

 above referred to. The " mountains " formed by the main 

 trap sheet are, beginning on the southeast : Higby (or Besick) 

 Mountain, Chauncy Peak and Lamentation Mountain, the 

 Hanging Hills group northwest of Meriden (consisting of 

 Cat-hole Peaks, Notch Mountain and "West Peak), Short Moun- 

 tain, High Rock and Shuttle Meadow Mountain, and Bradley's 

 Mountain, before coming to Cook's Gap, a pass followed by 

 the !STew York and New England railroad westward from New 

 Britain. The evidence seems to me very strong that the faults 

 separating all these blocks were produced after the trap sheets 

 had taken their place in the stratified series, all the sheets here 

 shown being extrusive surface flows, poured out during the 

 accumulation of the aqueous strata. 



