236 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Feb. 5, 



The marly beds contained : — 



Modiola Sowerbyana, d" Orb. 



Pholadomya, sp. ? 



Trigonia Phillipsii, Mor. §■ Lye. 



Gervillia acuta, Sow. 



Pecten, large (probably lens, Sow., or 



new sp. ?) 

 Ceromya Bajociana, d'Orb. ? 1 

 similis, Lycett ? J 



The hard Nerincea zone was present, but I could not detect the 

 presence of slate. At about half a mile south-west, however, near 

 to Deene Lodge, are more modern pits, where slate is quarried ; and 

 these present the extreme south-western point at which slate 

 equivalent to the Collyweston Slate has been found. 



Deene. 



At Deene, two miles and a half north-east of Weldon, is a large 

 stone- and brick-pit ; which exhibits, under four feet of sand, soil, 

 and rubble, about six feet of the Lincolnshire Limestone, having at 

 its base three feet of a bed with " potlids," representing the Colly- 

 weston Slate-bed : below this, the Lower Estuarine occurs, of con- 

 siderable tbickness and very different in character from the same 

 bed in the Northampton district — reddish sand, four feet ; grey sand, 

 with vertical plant-markings, three feet ; a very dark chocolate 

 almost black shaly clay, in very thin layers, five or six feet 

 beneath this, slate-coloured clay, containing a zone of iron-pyrites 

 then several feet of the ferruginous beds of the Northampton Sand 

 and below all, the Upper Lias Clay. 



Upon my first examination of this pit, I was uncertain as to 

 whether the Ferruginous Beds of the Northampton Sand were not 

 wanting here, and as to whether the clays below the vertical plant- 

 bed (as they yielded no fossils as an indication) were Lower 

 Estuarine or Upper Lias. Mr. Judd has told me that he encountered 

 the same difficulty in the first instance ; but that, fortunately, a well 

 was sunk, which passed through these clays for 10 feet, pierced 

 several feet in thickness^of the Ferruginous Beds of the Northamp- 

 ton Sand, and dipped into the Upper Lias Clay below. 



Detailed Section at Deene Bricle-jait. 



ft. in. ft, in. 



I . Baring — soil, sand, and rubbly stone 4 



(2. Marly limestone, of various degrees of hardness, in 



.£j 6 I courses about 6 inches in thickness 1 6 



■§ o 3. Sandy bed, containing rounded calcareous concre- 



£"<§! tions 1 6to2 



8 3 1 4. Hard subcrystalline limestone, sometimes blue- 



•3 S hearted, containing numerous Nerinace 2 6 to 3 



5. Sand, with " potlids," the latter very hard — Colly- 



l weston Slate 3 to 3 6 



(6. Reddish Sand 4 



7. Grey Sands and Clay, with vertical plant-markings 3 

 <^ 8. Dark chocolate, very shaly, thinly laminated clay, 



1 a 1 about * 6 



•5 to 9. Slate-coloured Clay, with masses of iron-pyrites, 



o about 4 



^ ^ 10. Ferruginous Beds (several feet). 



II. Upper Lias Clay. 



