138 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 
PLATE IV. 
Overlying sandstone traversed by a small leader from the trap sheet of 
Gaylord’s Mountain at Roaring Brook, locality 3. See pp. 115 and 
116. 
Angular fragments of trap imbedded in sandstone on the back of the 
anterior ridge of Higby Mountain, half a mile southeast of East Meri- 
den, locality 5. See p. 107. 
Drawing from a microphotograph of a section of vesicular trap from the 
ridge posterior to Chauncy Peak at Highland Lake, locality 24. The 
trap is black, with white areas representing minute pseud-amygdules 
and an occasional prism of plagioclase; the large central space within 
the trap is an amygdule, containing clastic material (dotted) at the 
bottom, with the once horizontal lines of deposition now tilted parallel 
to the general monocline of the region; the upper part of the amyg- 
dule is filled with calcite, of which part is stained with some ferrugi- 
nous material (fine lines), and the rest is composite crystalline calcite 
(blank). See p. 115. 
Drawing from photograph of sandstone in contact with vesicular upper 
surface of trap, forming Lamentation Mountain, locality 18. The 
black areas are the thin walls separating vesicles; white spaces are 
amygdules of calcite. See p. 112. 
Drawing from photograph of hand specimen of sand grains filling open 
vesicles in trap, Falls of the Aramamit River. Two vesicles have 
lower bands of calcite, and the remaining space filled with clastic 
material. Locality 23, see p. 114. 
Breccia from fault in a road-cut in the second posterior ridge to Salton- 
stall Mountain, near Branford, locality 21. This fault is probably a 
branch of the great fault by which the Triassic formation is limited on 
the east. See p. 114. 
PLATE V. 
The City Quarry at Meriden, looking northwest; locality 19. a, a, 
the lower flow in the southern part and the western alcove of the 
quarry ; 6, 6,5, the upper flow, forming most of the mass here exposed ; 
c, c, c, breccias of angular trap fragments and sandstone, traversing 
the quarry. See pp. 112, 127. The northern extension of Cat-hole 
Ridge is seen in the distance. 
