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. 
Percival’s notation, A. E. III. (4). 
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. ot 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 underlying 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 rounded 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- 
donbtedly 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 
