225 



Plate XXV. 



Near view of consolidated siliceous alluvia forming part of 

 old river terrace, coastal ridge, near Ardrossan. 



Plate XXVI. 

 View of Rock} 7 Point (looking south), situated on coast, 12 

 miles southward of Ardrossan. The Point, which is 70 feet in 

 height, consists of ancient fresh-water beds, some of which have 

 become consolidated by the introduction of secondary silica. The 

 higher of the two human figures seen in the photograph stands 

 upon the chief bed of consolidated alluvium contained in the 

 section. 



Plate XXVII. 

 A large block of consolidated alluvial sandstone on the beach, 

 about half-way between high and low watermark, at the base of 

 Rocky Point cliff. The honeycomb form of the rock illustrates the 

 irregular character of the silicification. 



Plate XXVIII. 



Sea cliffs at Ardrossan composed in their middle and lower 

 portions of mottled sand-rock of Pleistocene Age. A narrow shelf, 

 situated near the upper part of the cliffs, forms the dividing line 

 between the Pleistocene mottled clays below and the Recent reddish 

 clays and gravels which rest unconformably upon the former. The 

 rain washes down the softer rocks near the top of the cliffs, and 

 this to some extent obscures the features of the mottled beds that 

 lie beneath. 



Plate XXIX. 



Section in the sea cliffs, exposed by an excavation near the 

 landward end of the Ardrossan jetty, showing an unconformity ; 

 the lower portion of the cliff face is composed of the Pleistocene 

 mottled sand-rock, and the upper portion, consisting of Recent 

 reddish clays and gravels, occupies an eroded gutter in the former. 



