296 Prof. J. W. Gregory—Geology of Central Spitsbergen. 
The succession above the Trias in this part of Spitsbergen was seen 
to the west of Lower Sassendal during an ascent, in company with 
Sir Martin Conway, of Mount Lusitania. The sequence is as follows, 
in descending order :— 
Section II. 
Jurassic. ; 
(g) Grey to greenish flags with beds showing cauda-galli and cone-in- 
cone structures. 
(f) Quartzose grit. 
(e) Pebble bed and conglomerate. Snow covered. 
Middle Trias. 
(d) Black shales and upper nodule bed. Snow covered. 
(c) Buff to greenish flags; no fossils seen. 
(6) Escarpment shales and flags. 
(a) Middle Nodule bed. 
Carboniferous. 
Further east than the Mount Lusitania section an ascent from the 
de Geer Valley crossed the same general sequence. 
(h) Grits capping the plateau. 
Jurassic+ (g) Flags with cauda-galli structure. 
(f) Shales with intersecting and radial tracks (so-called Starfish bed). 
(e) Hyperite sill which alters and bleaches the shales above and below. 
Middle {e Upper Nodule bed in black shales. 
: b-c) Flags. 
ier iB Middle Nodule bed. 
The intrusive character of the hyperite, and excellent sections of 
trough faulting are shown in coast sections between the de Geer 
Valley and Advent Bay. 
From the eastern end of the Sassendal the Fulmar Valley affords 
a good section from the Carboniferous to the Jurassic ; and as the 
beds dip southward both the Carboniferous and Triag disappear, 
and the Jurassic beds form the chief rock exposures on both sides 
of the Upper Fulmar valley. 
The character of the Jurassic and Cretaceous beds was best seen 
south of Advent Vale, in the scarps from Bunting Bluff to the 
Booming Glacier. 
The succession may be thus summarized :— feet. 
Middle Brown shales. 
Cee ae Quartzitic flags with few pebbles. 500 
f Conglomerate with pebbles of quartz, chert, granite, etc. 
Bunting Bluff Limestone. \ 
J : (raat nodules: fossiliferous. 400 
uTAsste ) Rotten flags 
gs. 
Shales with plant remains; few exposures. 1000 
The intrusive nature of the hyperite is well shown in the north- 
east wall of the Fulmar Valley; a sill oscillates slightly in level 
for some distance and then cuts steeply across the strata, becoming 
thinner in its ascent. 
