Yol. 54.] GEAVELS IN BERKSHIRE AND OXEOEDSHIEE. 



593 



know, are only found in the Triassic pebble-beds. I am told that 

 this quartzite is in situ in the Isle of Jura (Hebrides). The quartz- 

 felspar grits, though not typical Torridonian, are very probably 

 from the Bunter, but rock somewhat of this type, which occasionally 

 comes very near normal Torridonian, occurs in situ in the north- 

 western Longmynds.' 



The following table will show the composition of the Quartzite- 

 gravel at different localities in the district under review : — 





35 '^ 



Badldon Kiln. 

 J/55 feet O.D. 





1^' 





Flint-pebbles 



Per cent, 

 13 

 34 

 23 

 10 

 2 



4 

 3 



5 

 1 



2 

 3 



Per cent. 

 3 



25 



8 

 19 



17 



3 



'n 



Per cent. 



iiJ 



8 



10 

 2 

 2 



2 



Per cent. 

 14 



14| 



18 



3 



7 



22 

 9 

 3 



6 



1 



-:> 



Per cent. 



8 

 37 

 15 



3 



5 



18 

 4 

 5 

 1 

 1 



1 

 1 



1 



Subangular flints 



Quartz-pebbles, opaque ... 



Do. vitreous ... 



Quartzite-pebbles, grey, etc. 



Do. bron^n & 



purple 



Grit 



Sandstone 



Soft rocks 



Lvdite 



Subangular sedimentary 

 rock 



Igneous rocks 



Chert and i asper 



J L 



Slate, etc 



Conglomerate 



Gravel of a quartzitic character is abundantly scattered over the 

 fields between Stonesfield and Charlbury at about 500 feet above 

 sea-level ; and it was observed at Leaiield, above Wychwood 

 Forest, at 550 feet, on the ridge between the Windrush and the 

 Evenlode. In the higher Windrush valley it is absent. At 

 Bourton-on-the- Water, a valley-gravel, at a level of about 430 feet 

 above Ordnance-datum, appeared to consist entirely of materials 

 derived from the Cotteswolds. The quartzites, however, are 

 abundant in the Evenlode valley. No section was seen, but at 

 Adlestrop the surface of a field at a level of 460 feet above 

 Ordnance-datum showed that only about one-third of the gravel 

 consisted of local Oolitic material, the remainder being pebbles of 

 quartz, quartzite, grit, etc. 



At Moreton-in-the-Marsh there is a large gravel-pit near the 

 cemetery, | mile east of the town. It is only about 30 feet above 

 the source of the Evenlode ; but, as it lies on the watershed common 



