262 



Notices of Memoirs — 



The following strata have been penetrated : — 





feet 



in. 



Shales 



17 







Blue limestone 



2 







Shale 



5 







Blue limestone 



2 







Shale 



4 







Limestone 



1 







Shale 



4 







Limestone •' 



3 







Shale 



4 







Limestone 



4 



% 



Blue shale ... 



16 







Grey shale 



3 







Hard shale ... 



14 







Shale vfith crystals of carbon 







ate of lime 



9 



6 



Grey shale 



. 1 







Greenish shales with vein o 



f 





gypsum 



20 







Impure gypsum 



9 







Pure gypsum 



4 







Impure g5'psum 



. 8 







Pure gypsum 



Dark gypsum, impure 



Blue shale ... 



Gypsum in nodules and veins 



Gypsum marl 



Black sulphurous marl 

 Greenish sand, with nodules 



of chert 



■Sandy shate, with nodules of 



chert 



Carbonate of lime veins 

 Hard sulphurous black shale 

 Soft sulphurous black shale 



Hard shale with chert 



Black shale 



Very sulphurous black shale 

 Paler shade with gypsum 



veins 



Dark shale 



Grey shale "Kimmeridge 



clay," very fossiliferous ... 



feet in. 



3 



13 



3 



13 3 



8 



1 



21 



38 



2 

 12 



7 



12 



2 



12 



378 



Mr. J. H. Peyton considers that the first 180 feet represent the 

 Purbeck beds, and the next 110 feet the Portland beds. 



Mr. W. Toplej, of the Geological Survey of England and Wales, 

 vfho has carefully examined the cores between the depths of 376 

 feet and 6-S6 feet, says : — 



" We cannot be q^uite certain at what exact depth in the boring 

 the Kimmeridge Clay began, but it was probably at about 290 feet 

 from the surface ; this would give 86 feet below the top of the Kim- 

 meridge Clay as the point at which the detailed examination com- 

 menced. In the higher part of the Kimmeridge Clay the following 

 fossils had already been noted (by Prof. Phillips, Mr, Willett, and 

 Mr. Peyton) :— 



Discina (Patella) latiesima. 



Fecten. 



Lingula ovalis 



Vstrea. 



Modiola. 



Lima (?) 



" The Kimmeridge Clay, as yet met with, presents but few varia- 

 tions in character. It is nearly all a very dark grey or blackish 

 clay, generally rather sandy and calcareous. Some specimens, which 

 V7ere preserved from about 330 to 350 feet from the surface, are 

 rather hard, and show no tendency to split up. Those from about 

 380 feet, downwards for about the next 100 feet, can only be pre- 

 served v^'ith great difficulty ; the clay is soft, and the cores split up 

 into numerous laminae, generally breaking at the places where fossils 

 are preserved. Fossils are very numerous in this part, and it is, 

 perhaps, partly owing to this that the cores break up so readily ; in 

 the higher and lower parts, where fossils are generally much less 

 abundant, the cores do not so easily break. 



" At 500 feet from the surface (and for a few feet below) the cores 

 are hard, and break with a slightly conchoidal fracture ; this is again 

 the case at 640 and 650 feet. But the only important deviation from 

 the usual clayey character of the bed is a hard, tough, rather sandy, 



