328 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jlllie io, 



The cuttings continue through the drift for four miles, ns above de- 

 scribed, Section 4, p. 320 ; the southern incHnation of the hue com- 

 mencing about the north end of the long Drift section. 



With the following section commences a new series of beds, the 

 characters of which have not hitherto been fully noticed, and which, 

 from their peculiar features and position between the Oolite and Corn- 

 brash, ai'e the equivalents of strata not heretofore recognized as oc- 

 curring in this district. Two of the sections only, those of Essendine 

 and Danes' Hill, show their full development ; but the descriptions 

 will be continued in regular order, so as to explain the variable nature 

 of the strata, their thinning out, and the denudation to which they 

 have been subjected. 



South of the road from Colsterworth to Burton Goggles the section 

 exposes in descending order the following beds : — 



feet. 



Soft brown marly rock, with two intercalated layers of 

 Oysters ; the rock contains also Perna quadrata, Modiola, 

 Lima, Serpuhi, &c (5 



Striped clays 2 



Bituminous clay, with marine 1 shells : in this bed was found 

 a large stem of a tree \\ 



Grey clay, with nodules of limestone ; and with vertical stems 

 or roots of plants proceeding from the upper bed. 



Green and white clays 2 



Slaty rock, shelly, containing Ostrea and Cyrena. 



The oolite occurs in the valley between this point and the section 

 at Corby road, where it forms, for 7 feet, the lower part of the cutting ; 

 it consists of shelly oolite and freestone with false bedding, the incli- 

 nation being 30° north. The oolite is covered, as is generally the 

 case throughout the district where the upper clays extend, with a 

 ferruginous band 1 foot thick, with occasional patches of selenite and 

 Websterite ? ; over this are 1 5 feet of dark and greyish clays, with 

 bands of more bituminous clay and lignite, but no traces of shells 

 were observed. The clays and oolite continue through the next 

 cutting, but the beds are less regular, the clays indenting the oolite, 

 which is very rubbly where exposed, but at the base is fine-grained 

 and occasionally shelly : the principal joints are N.W. and S.E. 



The Sway field Cutting presents a similar section to those just de- 

 scribed, consisting of dark green and brown clays, wavy and irregular, 

 overlying the oolite and the intervening ferruginous band ; the oolite 

 is shelly in places, contains marly concretions or pebbles, and is some- 

 times pinkish and fine-grained, at others coarsely pisolitic, and bluish 

 in the centre of the mass. Over some parts of this, as well as the 

 two preceding sections, traces of small angular flint and oolitic gravel 

 were observed. 



The Counthorpe Cutting is a continuation of the same series of 

 beds, but increased in thickness and varying in characlcr ; in de- 

 scending order : — 



