108 BULLETIN OF THE 



anterior ridge. Following it about a third of a mile, and then turning 

 west into the woods, a few ledges are found consisting of ashes and 

 bombs, such as are more fully described under locality 8. Half a mile 

 farther south, the sandstone lying on the back of the highly vesicular 

 trap is exposed in the roadside. Numerous vesicular fragments of trap 

 are included in the sandstone. Clastic deposits are seen in many of the 

 vesicles in these fragments. 



Locality 7. Southwest and west of Chauncy Peak. Percival's Report, p. 364. 

 PercicaVs notation, A. E. III. (5). 



The road from Meriden to Westfield crosses this anterior ridge about 

 half a mile southwest of Chauncy Peak, and the above-mentioned ash 

 and bomb structure is visible in roadside cuts (Fig. 5, locality 7'). A 

 farm road follows the vesicular back of the ridge to the northwest, and 

 the ledges to the west of it show the same structure again, locality 7. 



Locality 8. Section numbers, 83, 84 a, 209-212. Anterior of Lamentation Mountain. 

 Percival's Report, pp. 265, 266. Percival's notation, A. of E. III. (5). 



The road from Meriden to Berlin follows the base of the ridge ante- 

 rior to Lamentation Mountain for some distance (Fig. 5). About two 

 miles north of Meriden, a curious bluff of volcanic ashes and bombs is 

 seen in the face of the ridge, locality 8. The tmderlying sandstone is 

 first seen at the foot of the bluff ; the overlying sandstone is found by 

 crossing the ridge to its eastern slope, locality 8', passing several trap 

 ledges in the woods on the way. 



The trap is underlain by a bed of fine lapilli, about thirty feet 

 thick, containing numerous roimded blocks or bombs of dense trap, 

 from six inches to three feet in diameter ; one of these blocks is half 

 imbedded in the underlying sandstone. This basal ash bed is un- 

 doubtedly the. same as the one mentioned in the two preceding local- 

 ities, but it is not seen much farther north ; half a mile in that direction 

 there is a local trap conglomerate in the same horizon with the anterior 

 sheet ; vesicular and water-worn pebbles are here interbedded with sand, 

 as if this point were not far distant from a wave-beaten margin of the 

 anterior lava sheet. The trap of the ridge is frequently cavernous 

 and amygdaloidal, and remarkably so near the upper surface. No local 

 closeness of grain at upper contact ; overlying sandstone deposited 

 parallel to inequalities of trap surface ; fissures and vesicles near sur- 

 face filled with sand, connecting upwards with overlying sandstone. 

 Fragments of vesicular trap and abundant grains of water-worn glassy 



