MUSEUM OF COMPARATIVE ZOOLOGY. 111 
and irregular texture near its upper surface ; stratification of sandstone 
conformable to irregularities in the upper surface. Intimate mixture 
of sand grains and trap fragments along and above line of junction ; 
surface fissures and vesicles filled from above with sand grains, distinctly 
stratified parallel with the sandstone bed above. The hardness of the 
overlying sandstone is due to induration by infiltrated calcite, etc., and 
presents no evidence of being derived from baking by heat. See special 
account. 
Localities 15, 16. Section numbers, 5-17, 77. Totoket Mountain, inside south and 
north hooks. Percival’s Report, pp. 336-338. Percival’s notation, E, LU. 
Totoket Mountain is a well formed crescent, next north of Saltonstall 
Mountain. Exposures of the upper contact with the sandstone were 
found in a stream, locality 15 (Fig. 2), half a mile northwest of North 
Branford, in the southern hook of the crescent; and again in a stream- 
bed inside of the northern hook, locality 16 (Fig. 3). Another stream, a 
mile southwest of the last, locality 16’, cuts a channel in what seems to 
be a bed of clinkers. 
The trap is porphyritic, and originally possessed a glassy base ; upper 
surface very vesicular and irregular ; sandstone lamination conformable 
to uneven contours of surface ; intimate mixture of rounded (water- 
worn) trap grains and sands at contact ; occasional trap fragments in 
sandstone for a few feet above ; clastic grains of trap, quartz, etc., fill 
vesicles, with lines of deposition parallel to the stratification of the sand- 
stone above ; sand in vesicles is connected with the sandstone above by 
narrow necks. The overlying sandstone, locality 16, is indurated by 
cementation, and shows no signs of baking. 
Locality 17. Section numbers, 204-207. Higby Mountain. Percival’s Report, p. 351. 
Perewal’s notation, E. ILI. (4). 
The eastern base of Higby Mountain, south of the road from Meriden 
to Middlefield, is followod by the upper course of Fall Brook, which at 
a point about a quarter of a mile south of the road lays bare a valuable 
exposure of sandstone lying on the trap, locality 17 (Fig. 4). A second 
exposure is found a little farther south, locality 17’, Numerous frag- 
ments of vesicular trap enclosed in sandstone are found in the stream 
for some distance northward. 
The trap is porphyritic, and originally glassy ; upper surface very ve- 
sicular, much decomposed, and uneven ; not excessively fine-grained at 
