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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 

 them to the Upper Oolite. At (a) the strata are very obscure, being 



