200 THE GEOLOGICAL STKUCTUEE OF THE 



bat Ave know that at least 20 feet of rock must be present 

 on the evidence of ^Barns Batch. If the thickness be no 

 more than this, it is possible that all these beds were 

 deposited contemporaneously with the Freestone ; but if the 

 thickness be greater, two interpretations present themselves : 

 (1) There was a considerable thickness of limestone deposited 

 subsequent to the Coralline beds ; or (2) all this limestone 

 was deposited before the Coralline beds, and therefore a 

 much greater thickness of a more coarsely-textured stone 

 was laid down at the south-western portion of the hill, 

 while 20 feet of Freestone were being deposited near the 

 church, and about 4 feet of limestone in the roadside 

 quarries. 



The solution of the question may be a matter of economic 

 importance (see p. 221) ; and it is certainly of scientific in- 

 terest — especially if the first supposition prove correct. 



That portion of the hill which is crossed by the Main-road, 

 and lies near East Dundry village, may now be dealt with. 



Section III. 

 The Middle of the Hill. 



The Nortliern Main-road Quarry near 



the " Biitchers' Arms.'' ^ 



fc. ins. 



Coralline Beds. 1. Bubble and soil 3 



1 The exposure at the Southern Main-road quarry gives very similar 



details to this one ; but, capping the strata of the Sauzei hemera, there is 



the following bed : — 



ft. ins. 

 Garantian^. 1. Grey, crystalline, somewhat ironshot 



' ragstone.' Astarte Manseli,Ithynch. 



Buhtetraedra , Aulacothyris carinata. 



Corals 10 



This deposit is not found in the Northern Main-road quarry. 



