212 THE GEOLOGICAL STRUCTURE OF THE 



upon the Toarcian — Dumortieyia-heds, and that no deposits 

 of Aalenian or Bajocian age are present. Consequently the 

 Bajocian and Aalenian beds must successively disappear 

 between East Dundry and Maes Knoll, presumably on 

 account of denudation; but where, we can only suggest 

 approximately on our diagram. However, we have found 

 the Ironshot rubble in a ploughed field half a mile east of 

 Walnut Farm. 



West of East Dundry tJie Ironshot Oolite is found in the 

 quarries on the Main-road ; but it does not extend to the 

 freestone quarry near the church. How far east of the 

 main road it disappears we can only suggest in the diagram, 

 since we have no data after passing the north roadside 

 quarry. 



The line of Bajocian denudation is consequently shown 

 in our diagram with a slight easterly rise from the west 

 end of the hill to East Dundry ; then it continues practi- 

 cally level for a space, and finally falls with an easterly dip 

 to Maes Knoll. It is indicated by a thick dark line. 



The one other point in connection with this diagram 

 which demands our attention is the rapid easterly attenua- 

 tion of the freestone. We allude farther to the economic 

 aspect of this matter (see p. 220). 



V. The Stratal and Falnal Sequence. 



The structure of Dundry Hill and the sequence of its 

 deposits — in the upper portion — having been given, it is now 

 possible for us to construct a generalized Table of the full 

 sequence of rocks to be met with in the hill, to assign to 

 these rocks the dates of their deposition, and to give, in a 

 Faunal Table, combined therewith, the names of different 

 organisms which lived during the various portions of time 

 (see Table II. facing this page). 



