186 



The Geology of the Berks 8f Hants Extension, 



,_i^.Wansdyke 861. 

 "■Martinsell 945. 



Pewtev Hill. 



coombs will be found to prevail 

 along the whole length of the chalk 

 escarpment. Fig. 9, is a section 

 through one of these coombs. It 

 commences at the river at West 

 Kennet, runs through the letter 

 " a " in " Large stones," up to the 

 well marked in the Ordnance map, 

 then takes the western fork and 

 passes through the escarpment a 

 little to the east of St. Ann's Hill. 

 It is continued to the stream 

 near Honey-street, and follows its 

 course by Bottlesford, Newing- 

 ton, and Rushall, down the Avon 

 valley. It has been necessary to 

 exaggerate the vertical heights 

 for the sake of clearness, but in 

 other respects the section is drawn 

 as correctly as the smallness of 

 the scale will allow. 



A section of the coomb branch- 

 ing off at the well, and through 

 the hill J mile to the east, is so 

 similar, except that the " col " or 

 dividing ridge is 60 feet lower, 

 that any other difference would 

 hardly be perceptible at the scale 

 used. 



The heights figured, and those 

 from which the section is drawn 

 have been obtained by levelling 

 with the spirit level. The height 

 of Pewsey Hill and of the hills 

 above Upavon which are drawn in 

 outline, were ascertained by the 

 aneroid barometer. 



