170 WORGRET HILL AND WAREHAM WATER SUPPLY. 



whilst about 1,000 yards away, in a north-westerly direction, 

 presumably the same clay was at one time worked on the 

 Binnegar Estate between the 100 feet and 50 feet contours. 

 On the Plan of Worgret Hill (Fig. i) this spread of clay is 

 roughly indicated in an elongated patch, which terminates on 

 the western edge of the Plan close to the old brickfield. It is 

 not claimed that the position is laid down accurately throughout, 

 nor is it possible to define the boundaries of the outcrop. 



On crossing the Heath-road to the north side, the indications 

 change at once, and there is every appearance that the Plateau- 

 gravel rests upon sand, as is the case at the Waterworks. Thus 

 in this traverse the line of the road approximately marks the top 

 of the clay series. From here to the well-mouth is a distance 

 of about 700 feet, and this traverse may fairly -represent the 

 outcrop of the Higher Sand (A. of the column). There is an 

 excavation very near the centre of the cross in the main earth- 

 work, but inclining somewhat towards the north-west arm, where 

 the Plateau-gravel is seen to rest on sand, and it is noteworthy 

 that the inclusions in the gravel are of a sandy nature, whereas, 

 as we have seen, at the old gravel pit they are of a clayey nature. 



On referring to the details of the Worgret well and borehole, 

 it will be seen that the upper surface of the clay series (B.) is 

 about 50 feet below the mouth of the well, whereas on the Heath 

 road it may be said to outcrop. The distance between these 

 points, which are approximately on the same level, being 

 700 feet, there is a fall of i in 14 exactly north-east. This 

 is equal to 4, but, allowing for the roughness of the calculation, 

 we may put the dip at 3 S.W.-N.E. On the whole, I conclude 

 that the maximum dip is in this direction, and the dip is 

 probably rather less in a direction parallel to the line A-B. 

 (See note as to calculation of dip on the folding plate (Fig. 5). 

 In Fig. 2, which shows the general structure of Worgret Hill in 

 cross section, the amount of dip is given at 3, though possibly 

 rather less along that line. Here the spread of the Clay series 

 on the dip makes itself manifest in the amount of water which 

 oozes out at the line of junction with the Higher Sand. The 



