ROCKS AT MOUTH OF TEMPERANCE RIVER. 325 
“Two Islands,” which are columnar rocks with the outline of Fig. 26, and 
of the mouth of Temperance River, are also very instructive. 
Fic. 26.—Profile of island at mouth of Two Islands River. 
The last-named place is possibly the most interesting of all. A short 
distance from its mouth the river makes several falls, the first one into, the 
rest along the course of a narrow gorge, which sometimes reaches 50 feet 
in depth, but is so narrow that in places one can step from one to the other 
of the overhanging walls. The gorge is a succession of well-smoothed pot- 
holes broken into each other. There are displayed here a number of very 
thin layers, the massive columnar portions often not exceeding two to four 
feet, and the very strongly developed amygdaloids running even below 
these figures. A number of these beds have very plainly marked basal 
amygdaloids, with relatively sparse spike amygdules. At two or three hori- 
zons, streaks of red sandy shale were noticed between one of these amyg- 
daloids below and a massive layer above. The detrital matter is often in 
mere films, and at times is entirely absent. In places it is found to have 
aggregated in irregularities of the underlying amygdaloid, when for a short 
Fig. 27.—Section on Temperance River. 
distance it may have something of a thickness. This is finely displayed 
on the northeast side of the basin at the mouth of the river, as shown 
in the following section, which represents a wall some 80 feet long and 20 
