66 THE STEUCTUEE OF THE G-ULLY, DUEDHAM DOWNS. 
(&, d.) Vertical thrust planes of the same type^ but with 
differing directions are exposed^ as mapped, at h and c. At 
the latter there is also an anticline. 
There is some evidence of the faulting and an anticline 
at d. 
(e.) By far the most interesting feature in the Gully, but 
for which this paper would never have been written, is to 
be found on the southern side of the little depression that 
cuts off the apex of the triangular tongue of Gully Oolite. 
Here a series of shales is exposed, in a rough and steep 
path , and these are the problem for which it has been most 
difficult for me to find a satisfactory explanation. 
Here, in a hollow in the Oolite, which dips at 26° to the 
S.S.E., are seen from above downwards — 
(1) Horizontally bedded cream-coloured shales and fissile 
very thin bedded impure limestones, in appearance strikingly 
like the Naiadita beds of the Hhaetic at Hedland and else- 
where. 
(2) A nearly vertically bedded series, dipping very steeply 
to the north, consisting of two bands of massive limestone, 
together about a foot thick, and parallel with these red 
calcareous sandstone, very crumbly, with parallel colour- 
bands in it of a much darker brownish-red. The limestone 
is not an oolite. 
(3) Dark shales and calcareous sandstones arranged as. 
an anticline. 
(4) A thick band of vertical bars of calcite crystals. 
(5) A thick band of rather fine grained calcite rock. 
(6) (Gully Oolite). 
The shales, etc., are therefore bounded on the left by a 
prominent vertical bluff of Gully Oolite ; heloio by a hori- 
zontal shelf of Gully Oolite ; on the right by a retreating 
and gently sloping surface of Gully Oolite ; behind — about 
two yards back at the top apparently — ’by the same, the 
