Vol. 62.I 



LIMESTONE OF THE MENDIP AREA. 



339 



(ii) Classified Lists of Exposures, arranged zonally. 



In the following lists are included all those exposures in the 

 Mendip area which I have examined personally. In the exami- 

 nation of so large an area in a limited space of time, it is, of course, 

 likely that some exposures have been overlooked ; and this statement 

 applies especially to the Cleistojwa-Zone, many exposures of which 

 occur in by-lanes. But it is claimed that the following lists include 

 all the quarries and important sections in the area, besides a 

 majority of the disused quarries and isolated exposures of importance. 



.For convenience of reference, the exposures are assigned, so far 

 as possible, to the several periclinal masses ; exposures in the 

 isolated masses north and south of the main outcrop are tabulated 

 in separate sections, under their respective zones. 



The column headed 'Sheet' defines the sheet of the 6-inch 

 Ordnance-Survey map (Somerset) on which each exposure lies ; 

 while the column headed ' Horizon ' contains information as to 

 the subzonal position of the exposures, in all cases where I have 

 been able to determine the horizon with accuracy. 



Cleistopora- Zone. 

 Where best exposed in the Mendip area : — 



(a) The Burrington Section. 1 



M well exposed ; K x and K 2 poorly exposed. 



(b) The Maesbury railway-section (Somerset & Dorset Joint 

 Eailway). 



M not exposed ; .K 1 and K 2 splendidly exposed. 



List of Exposures in the Mendip Area. 

 A. The Black-Down pericline. 

 North side. 



Locality. 



Description. 



Horizon. 



Sheet. 



Burrington Combe.. 



(See below, footnote) 



M, K x , K 2 



18 N.W. 





South side. 



South-east of Ship- 

 ham. 



Section in the road-cutting leading 

 from Longbottom Farm to Trot's 

 Corner 



18 S.W. 



1 See Proc. Bristol Nat. Soc. ser. 4, vol. i, pt. 1 (1905) pp. 18-22. 



