44 
II. T. FERRAR. 
Top. (14) 100 feet — dolerite, which caps the sandstone 
(13) 200 feet — yellow sandstone 
(12) 100 feet — sandstone with occasional yellow bands 
(11) 100 feet — sandstone with ferruginous concretions (G77) 
(10) 200 feet — yellow sandstone 
( fl) 100 feet — sandstone with cylindrical casts (7 G 1—7 67) 
( 8) 200 feet — yellow sandstone with ferruginous concretions 
( 7) 50 feet — white sandstone 
( G) 200 feet — yellowish sandstone 
( 5) 100 feet — marble-like sandstone (679) 
( 4) 50 feet — nearly white sandstone 
(3) 10 feet — stalagmitic sandstone (678) 
( 2) GO feet — almost white sandstone 
Bottom. ( 1) 30 feet — variegated brown and yellow sandstone (hard). 
The variegated brown sandstone (l) at the base appeared to be altered to a slight 
extent ; it is harder than most of the higher beds, and the ferruginous concretions in 
it are sometimes two feet across. They are flattened horizontally, and are sometimes 
joined together. 
The stalagmitic sandstone (3) is so called because stalagmites stand out between 
successive beds on the rock-face, and it would appear that the rock had been locally 
hardened by infiltration. It is made up of alternate hard and soft layers which are 
each about a foot thick. 
The marble-like sandstone (5) (G79) was harder than that above and below, and 
locally its surface has a superficial glaze. The ferruginous concretions (11) (G77) in 
the upper band often weather out as balls up to a foot in diameter ; sometimes, 
however, the concretions have disintegrated faster than the rocks in which they were 
imbedded and have left spherical hollows. 
Finger Mountain (B) (Fig. 22). 
Before we entered the district of the Dry Valleys, the Beacon Sandstone was 
examined near the foot of Finger Mountain ; though 10 miles south of the preceding 
area, it retains the same characters and appears to be barren of fossils throughout. 
Near the contacts with the dolerite, variegated bands (635) have been produced. At 
this spot the sandstone, like that at B 1} has been dislocated ; but again its general 
horizontally has not been disturbed, notwithstanding that intrusive sheets of dolerite, 
up to 500 feet thick, have forced their way along joints and bedding-planes. 
Finger Mountain (B) contains a wedge of sandstone which separates two sheets 
of dolerite (Fig. 22). One of these sheets caps the hill ; the other separates the wedge 
from the major portion of the sandstone which only just appears above the ice. The 
whole sequence occupies a cliff of about 500 feet high ; the wedge of sandstone is about 
100 feet thick at its eastward extremity, whence it thins westwards and disappears 
in a distance of about two miles. One bed of sandstone after another is cut out by 
the dolerite as it transgresses them upwards to join the mass which caps the hills to 
