THE SOUTH-EASTERN COALFIELD 393 



Astatic, Ammonites and Crustacea (?) are varyingly abundant ; 

 about 1,193 ft. it becomes somewhat calcareous and harder, but 

 near the base it is decidedly sandy. 



This massive clay bed is a very constant feature in all the 

 borings. 



? Kclloivay Rock and Com brash (12 17 — 1260 ft.). 



Between the Oxford Clay and the Bathonian limestone we 

 find fifty-three feet of doubtful age ; the upper part is provision- 

 ally referred to the Kelloway rocks passing into Cornbrash, but 

 this determination remains to be checked by the identification 

 of the fossils. 



The first foot is a sandstone rendered muddy by the admixture 

 of Oxfordian Clay. It is crowded with Gryphcea and casts of 

 Pectcn ; at 1,218 ft. it passes into a sandy loam-rock, full of fossils, 

 including Arcula and Tcrebratnla, very like Cornbrash. This 

 passes into a hard, shelly, calcareous grit, containing a little iron- 

 shot ; by 1,220 ft. it is a very dark rich green, very hard grit, full 

 of shining grains, and very compact; this is of a peculiar and 

 altogether distinctive appearance. The iron-shot becomes more 

 and more numerous; from 1,224 to 1,230 ft. they are all brown, 

 and not coffee-coloured, as in the Corallian above and in the 

 Corallian at Dover; from 1,230 ft. 6 in. to 1,233 ft- 6 in. it is 

 a brilliant dark green glauconitic marlstone rock, with many 

 white shells, chiefly Avicula. Then there is a 6-in. band of pale 

 grey marlstone, then again as before, only slightly brighter 

 green in colour, down to 1,236 ft. 6 in.; from here down to 

 1,245 ft. we find a washing of rather coarse angular fragments, 

 but at 1,246 ft. it is the same curious green rock, though not so 

 brilliant, still with Avicula; at 1,247 ft. it is dappled with black 

 clay, coarsely Oolitic, with Rhynchonella. From 1,257 ft- it is 

 a hard green marlstone crowded with coffee-coloured polished 

 iron-shot, very like the Corallian iron-ore of the Dover pits, with 

 Gryphcea, pyritous wood, belemnite of the B. oweni type, and 

 Modiola ; between 1,259 an d ^260 ft. it changes to a soft muddy 

 dark greyish sandstone. 



It will be interesting to determine the exact age of this 

 curious green rock, which has not before been noticed from any 

 Kentish boring. 



Bathonian (1,260 ft. — 135 1 ft. 6 in.). 



The Bathonian is represented by a massive oolitic limestone : 

 at the top it is hard, dense, and white in colour, a trifle muddy 



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