68 The American Geologist. August, L90S. 
parallel to the axis of Jacques Carrier Island and to the north- 
west shore of Kirpon Island. We have here, in fact, to do with 
almost the extreme northeasterly point which the "Appalachian 
trend" is known to reach. The dip of the cleavage is yo° 
to the KSK, corresponding to that of a system of rough, paral- 
lel joints in the pillow-lava. The dip of the bedding is hut 50 
in the same direction. Small dip-faults were seen in the sea- 
cliff. Greater dip-faults of considerable but unknown throw 
cut off the entire series along the axis of the "tickle" and again 
at a point about 370 meters to the southeast oi the headland 
at the siea-chasm. 
r.late pillow lava normal lava slare sandstone 
Figure 2. — Dip-section at northeastern end of Jacques Cartier Island, 
looking southwest. Horizontal scale, 130 feet to the inch ; verti- 
cal scale, 100 feet to the inch. Size of pillow exaggerated. 
Structure of the pillow-lava. — The pillow-lava, on account 
of its unusually good exposure and remarkable structures, oc- 
cupied most of the short period of time which was granted for 
the investigation of these rocks. The accompanying illustra- 
tions, together with the accounts of pillow-lavas by Gregory, 
Ransome, Teall, Peach and Home, and others, will render 
superfluous a complete verbal statement of the features char- 
acterizing the deposit. It is composed throughout of round, 
generally smooth, "bale-like," ''pillow-form," commonly ellip- 
soidal masses of lava. ( Plate XIV, Fig. 2. ) These are discon- 
tinuous and perfectly individualized as a rule. They range 
from 5 cm. to 2 meters or more in greatest diameter. The in- 
terstices between them, including the conspicuous' triangular 
spaces occurring where three or more pillows meet, are filled 
with coarsely crystallized calcite, quartz and dark, chert}- mas- 
ses. Those minerals thus form a sort of attenuated cement for 
the whole deposit. Calcite and quartz, chiefly the former, like- 
wise rill joints and the extremely numerous cracks that appear 
in roughly radial arrangement within each bolster-like mass. 
