112 BULLETIN OF THE 
upper contact. Sand grains fill vesicles and irregularities of surface, 
conforming closely to their shape; intermixture of sand and numerous 
large and small trap fragments along line of junction; occasional 
rounded (water-worn) fragments of amygdaloidal trap even five feet 
above trap sheet. ; 
Locality 18. Section numbers, 182-134. Lamentation Mountain. Percival’s Report, 
pp. 3851, 852. Percival’s notation, E. III. (5). 
A road passes the north end of Lamentation Mountain and bridges 
Spruce Creek, that flows northward from the back of the mountain. 
Exposures of sandstone on the trap are found up and down stream from 
the bridge; the best locality is about an eighth of a mile up stream, 
south (Fig. 10), where the exposure is of much interest. 
Trap porphyritic and glassy, particularly at upper surface; upper 
contact not locally of close texture ; upper portion of irregular texture, 
highly vesicular, with uneven, rolling surface ; sand grains fill fissures. 
and vesicles near surface of trap; narrow necks filled with the same 
clastic material connect these vesicles with the sandstone above ; inti- 
mate and complicated mixture of sand and trap over the upper surface 
(Fig. 15) ; stratification of sand in vesicles and above sheet. conformable 
to surface, and generally parallel. 
Water-worn fragments of vesicular trap occur in sandstone for two 
or three feet above surface of sheet. The vesicles in these fragments 
often contain small particles of trap mixed with quartz and muscovite 
grains. 
Locality 19. Section numbers, 186-150. Meriden City Quarry. Percival’s Report, 
pp. 870, 871. Percival’s notation, E. IV. 1 (1). 
The small easternmost ridge of the Hanging Hills group (Fig. 5 
or 6) has been deeply quarried for railroad ballast and road metal at 
its southern end, and now presents an excellent dissection of a complex 
trap sheet, — the most instructive quarry in the region. It is about 
a mile north from the centre of Meriden. The trap of the quarry con- 
sists of a lower and an upper portion, separated by a.well defined surface, 
inclined to the eastward with the general dip of the Triassic monocline. 
The lower sheet is exposed for about ten feet below the surface of sepa- 
ration ; the upper, for sixty or eighty feet above it. Lower sheet ex- 
tremely porphyritic, vesicular, and glassy; upper part scoriaceous, of 
rolling, ropy surface, showing evidence of normal weathering previous 
to quarrying. A small amount of foreign clastic material occurs mixed 
