An ^■Eolian Dei^oait at Clevedon. 367 



General Aspect. 

 The deposits consist of sandy breccia, loamy sand with stones, 

 loamy sand, and sandy loam, and attain a visible depth of 60 feet, 

 the base, moreover, not being reached at that spot. Bnt they are by 

 no means confined to the Holly Lane section, though that is still the 

 best exposure. They have now been traced across the whole width 

 of the valley (known as the Vale of Gordano), and also for 2 miles 

 westward. Though sometimes very thin and sometimes absent 

 altogether, they seem to be scattered over 2 square miles of country. 

 Where thickest they are banked up against the flanks of the hills, 

 a feature which is extremely pronounced at Holly Lane, as may be 

 seen in Fi"'. 3. 



C.'CS f A^rfX ,■ 



FlG. 2. — Sketch-map of the Pleistocene deposits shown by the stipple. Scale : 

 1'13 inch = l mile. HLQ = Holly Lane Quarry, butlettei's a trifle to N. of 

 exact spot. DH = Dial Hill. Cas = Walton Castle. For other localities 

 see Fig. 1. 



Petrological Characters. 

 The Breccias are crowded aggregates of angular fragments, 

 usually 3-6 inches, but sometimes a foot or more in diameter, while 

 blocks 5 feet in length are occasionally found. Their angularity is 

 very marked, and rudely tetrahedral forms are very common. 

 The tendency to this form is locally accentuated at Holly Lane by 

 a particular system of jointing in the parent rock (the Caniaia 

 oolite); but the triangular faces cannot fail to recall the much- 

 discussed " Dreikanter " of modern deserts. Equally pronounced 

 is their local origin. The breccias are not known to extend more than 

 60 yards from the hillside crags. At Holly Lane every block 

 examined is from the Caninia oolite of the Carboniferous Limestone^ ; 

 while at East Clevedon Gap nothing but limestones of the Z zone 

 (witli one or two blocks of the adjacent Coal Measures), and at 

 ^ With one solitary but interesting exception, consida^^ on p. 372. 



