UPPER PORTION OF DUNDRY HILL. 229 



It will be seen, therefore, that Sanders' map approximates 

 more closely to our own than does that of the Geolog-ical 

 Survey, and that for the western portion of the hill it is 

 generally only a little outside our " Inferior Oolite " limit. 

 For the eastern portion of the hill there are considerable 

 differences between our map and his, which, like the Survey 

 map, shows far too great an area as "Inferior Oolite " 



XI. Conclusion. 



Although this account of the geological structure of the 

 upper portion of Dandry Hill is somewhat full of detail, 

 we should like to take this opportunity of impressing on 

 the geologists who have the opportunity to examine Dandry 

 rocks the large field which still lies open to them. For 

 instance, the definite collection of fossils m situ, so as to 

 fix exactly the date of their existence, and thereby sup- 

 plement as well as check the faunal lists which we have 

 given, is a very necessary piece of work. It will have 

 important bearings on phylogenetic questions, which de- 

 mand so much consideration in palaeontology ; and it will 

 influence the determination as to the value of certain forms 

 as species or otherwise. Much information is needed con- 

 cerning the rocks of Aalenian date, particularly as to strata 

 contemporaneous with the hard massive beds at Rackle- 

 down, which we have dated as belonging to the Murchisonss, 

 and j)6i'liaps in part to the hradfordensis hemerae. Then 

 there is the question as to the strata exposed at Barns 

 Batch on the south-western side of the hill, and as to what 

 is their connection with the other upper beds of Dundry : 

 are they contemporaneous with the Freestone and Coralline, 

 or are they of later date ? 



Further, there is the question of the exact limits of the 

 easterly extension of the strata of Aalenian and Bajocian 



