230 THE GEOLOGICAL STEUCTPKE OF THE 



date, and in fact the structure of that part of the hill 

 between East Dundry and Maes Knoll of iwhicli we are 

 at present quite ignorant, requires to be worked out in 

 detail. 



One point more we may notice with regard to the 

 palaeontology ; there is a very large field for work here for 

 any one living in the neighbourhood of Dundry. The 

 number of species found at Dundry which have never been 

 described or figured is a very large one, although from the 

 nature of their exposures several beds have been most in- 

 adequately explored. As with successive visits to the 

 Dundry sections new finds -are constantly being made, it 

 may be confidently asserted that many new forms yet 

 remain to be discovered. 



XII. Summary. 

 In this paper we give information on the following 

 points : — 



1. The general structure of the upper part of Dundry 

 Hill. 



2. The faunal sequence. 



3. A time-table of the deposits at Dundry, the Cottes- 

 wolds, and the Dorset- Somerset area. 



4. Economical details, concerning the Freestone, the 

 Roadstone, the Water-bearing beds, and Sites for Houses. 



5. A map of the Hill. This map shows the extent of 

 the deposits of different dates, and, together with the 

 diao-ram, it illustrates the facts — 



(a) That strata equivalent to what are called elsewhere Midford Sands, 

 Upper Lias, and Middle Lias (Marlstone) are present in the hill, the 

 tsvo former attaining a maximum thickness of more than 60 feet, whilst 

 the Marlstone outcrops at many points along the flanks of the range. 



(6) That the officers of the Geological Survey have apparently con- 

 founded the Marlstone Kock {an ironshot oolite of the date of the spinati 



