838 SEC. 16. - GEOLOGY AND MINING. 



graphs ; an example of the boring " crown " is placed on the bottom 

 shelf of the case ; specimens of long " cores " extricated in solid 

 masses as here shown are placed by the side of the case. 



The second boring commenced with a hole 8 inches in diameter, 

 yielding a 7-inch core ; this was gradually reduced, owing to the 

 necessity of lining the hole, until, at 1,670 feet, it was reduced to 

 a 2-inch hole, yielding a 1-inch core. 



The long diagram gives a detailed section of the strata passed 

 through in the second boring, which may be grouped as follows : 



Thick- 

 ness " Surface. 



PurbeckBeds - - J Shales, limestones, cement- stones,! 20() _ _ 



I and gypsum - w] - j 

 Portland Beds - - Sandstone- - H0*0 - 57 - 257 



{A variable set of strata ; chiefly"] 

 shales, and cement stones in j 

 the upper part, with many beds } 1,512 - 1,769 

 of sandstone and limestone in | 

 the lower part - J 



Coralline Oolite - Oolitic limestone - 17 - 1,786 



? ? - Shales, sandy shales, and limestone 117 - 1,903 



1,903 



There is still some uncertainty as to the relations of the lowest 

 strata ; they may belong to the Oxford Clay, or they may represent 

 the lower Coralline series of Dorsetshire. This point will be 

 cleared up as the boring progresses. The greater part of the 

 Kimeridge Clay is very fossiliferous, some of the fossils being new 

 to England ; the least productive parts are the highly calcareous 

 shales or cement stones ; some of the limestones are mainly com- . 

 posed of small oysters ; an example is shown in the small core at 

 the side of the case, "ft i ; 



The smaller diagram gives a section of the Cretaceous and Oolitic 

 rocks of the south-east of England ; distinguishing those previously 

 known in that area from those discovered by the boring. The 

 same point is brought out in the horizontal section, which also 

 serves to illustrate the structure of the Wealden area. A simple 

 inspection of these diagrams will show the amount of information 

 already obtained by the boring. If the Palaeozoic rocks should not 

 be reached, the boring will still have yielded most valuable results, 

 for we shall have acquired a knowledge of the Oolitic strata of this 

 area, such as could not possibly have been obtained in any other way. 



Some valuable beds of Gypsum were discovered in the Purbeck 

 Beds ; these are now being worked, giving rise to a new branch of 

 industry in Sussex. 



