**Nfoi 



1 largo 



»li 



pet. 



Politic 



?rai ti 



nil wcdiateij 



K*p 15. 

 ?sf one, q Uat , 



ic, Somem 



id, six raife 



', formed of 

 'heltenhwi 



h numeroiii 



nn<r 



somerset 



,V 



. 285, 



Mfttftf, C0D ' 





I 



neral a 

 •t into f 



c clays J* 



>r buil^' 



c exceP 1 f 

 ? proba^ 



rded b]' 



ncsto^ 



». 



# 



;l l s» r 



4 





OOLITE LIMESTONES. 



79 



70— Forest marble, shelly limestone, with included Uppee 

 pebbles of clay. These beds are quarried for flagstones, &c. Ga ^. et ' 

 Hilton, near Wincanton, Somerset. ' Wall-case48 



71 — Forest marble, shelly limestone, 



the form of thin-bedded flagstones. 

 ford, 



occurring 



m 



West well near Bur 



72. 



fi 



partly of Oysters, Pectens, &c. 

 sham, Wilts. 



v y x — 



Chapel Knap, Melh- 



73.— Forest marble, shelly oolite, forming a band of 

 theUy fat impure limestone in Bradford clay. — Tethury Road, 



Gloucestershire. 



The Bradford Clay consists of thin beds of clay, occurring 



here and there in the Forest Marble 



Pt 



At Bradford they 



Case 



74. 



Inferior oolite, pisolitic limestone. 



Leek 



Hill 



Hull's " Memoir 



This bed, locally termed " pea grit," forms the base of the 

 Inferior Oolite, over the somewhat limited area where it 

 occurs. Some of the nodules appear to be true concretions, 

 and exhibit a series of concentric layers of calcareous matter, 

 investing fragments of other materials round which they 

 have formed ; others, on the contrary, seem to be merely 

 worn fragments of limestone, and present no appearance of 

 any concentric structure. (See Edward 

 Map 44 of the Geological Survey," pp. 32-35.) 



75 — Purbeck limestone, impure limestone, called the 

 "devil's bed." — Sicanage, Dorset. 



76. — Purbeck limestone, impure limestone, contain- 

 ing numerous shells, of brackish- water origin, from the 

 Corbula beds of the middle Purbeck. 

 Dorset. 



(See Vertical Sections, sheet 22.) 



77 — Purbeck limestone, compact grey shelly lime- 

 stone, containing freshwater shells (Cyclas, 8>c) from the 



© 



Durlston Bay, 





