118
PROCEEDINGS OE THE GEOLOGICAL SOCIETY.
.Jan. 8,
and lying against them, but rising to a much smaller height, on ac-
count of their comparative softness, the Jurassic beds appear. The
accompanying sketch (fig. 2) shows the appearance of the junction
N.W.
Fig. 2. — Section in the Ravine above Clyne Kirk, showing the
junction of the Secondary and Palaeozoic rocks.
S.E.
x. Metamorphic (Silurian) rocks, a, b, c. Jurassic Kocks.
a. Sand and sandstone so broken up that the stratification is undistinguishable.
b. Beds of coarse white and yellow sandstone. 1 • fl t t rl
c . Finely laminated, highly carbonaceous sand and clay, J ° •*
of the Palaeozoic and Mesozoic strata on the north-east side of this
gorge. The Silurian rocks (a?) form the precipice, over which the
stream falls in a fine cascade. The Jurassic rocks here consist of
sandstones, argillaceous sands with much carbonaceous matter, and
Fig. 3. — Sketch of the Oolitic beds seen in Allt-Chollie (Colybum),
illustrating the manner in which they are crushed and broken near
their junction with the Palceozoic rocks.
^ f Lower Silurian Gneiss &c. seen
I a little higher up the ravine.
some thin beds of clay : these strata do not yield sufficiently perfect
fossils to enable us to fix their exact place in the geological series ;
but, judging from their mineral characters, I am inclined to refer