Yol. 50.] BORINGS AT CTJLEORD, WINKFIELD, WARE, AND CHESHTJNT. 489 



bringing before the Society a subject of so much interest as that 

 of the older rocks underground in the South-East of England, in 

 connexion with which we venture to say that it is of some 

 importance to get accurate knowledge of the beds above the 

 old rocks. 



We desire to acknowledge the great assistance that we have received 

 from our friend Mr. W. Hill, who has made some forty microscope- 

 slides from the rocks found in these borings, sending us descriptive 

 notes and critical remarks on all of them. These notes and opinions 

 are embodied in our paper. AVe have also to thank Mr. J. Francis, 

 the Engineer of the New River Company, and Messrs. Le Grand and 

 Sutcliff, for the information and the specimens upon which the paper 

 is based. 



[Since this paper was sent in to the Society Prof. Dawkins has 

 made an important addition to the literature of the great Dover 

 boring, in which he gives details of the Cretaceous and Jurassic 

 beds. 1 It is often a difficult matter to classify beds from specimens 

 brought up from great depths, and we are disposed to question 

 some of the classifications in this case, though we hesitate to 

 express an opinion without seeing specimens. We should expect 

 the section of the Cretaceous beds below the Gault, at the site of 

 the boring, to differ somewhat from that in the cliffs south-west- 

 ward, to which the author refers, especially as a great difference 

 seems to be shown by another deep boring at Dover, already 

 described by one of us. 2 



By some oversight the author has noted the Jurassic beds as 

 occurring only at two of the deep borings in or near London 

 (Richmond and Meux's), whereas they have also been found, more 

 lately, at Streatham, the boring at which place has escaped notice 

 in his table. 



We have thought it best to take this opportunity of noticing 

 these points, rather than to wait for the more convenient season 

 which depends so much on seeing a large set of specimens, and 

 which may be postponed to the good time that is often so long in 

 coming.] 



II. Tre Ctxlford Boring. 

 General Account of the Work. 



The site of this boring is just outside the northern edge of 

 Culford Park, about 1 mile S.E. of Rats Hall and 5 miles N.N.AV. of 

 Bury St. Edmunds : the height of the ground being about 110 feet 

 above Ordnance datum. 



The boring was commenced in 1890, and finished in 1891. Its 

 diameter is at the top 6 inches, and the boring is lined with 5-inch 

 pipes down to a depth of 583 feet. 



It was undertaken for the purpose of obtaining a supply of soft 



1 Trans. Manchester Geol. Soc. vol. xxii. pt. xvi. (1894) pp. 488-510. 



2 Quart.. Journ. Geol. Soc. vol. xlii. (1886) pp. 35, 36, and vol. xliii. (1887) 

 pp. 199-203. 



