tJPPER PORTION OF DUNDRY HILL. 



225 



As a matter of fact, so far as Dundry is concerned, the line 

 we draw to mark the commencement of deposition in Aalen- 

 ian time should coincide with, the line which the officers of 

 the Geological Survey have drawn as the base of the Inferior 

 Oolite. That there is not always such coincidence is due 

 to an error already alluded to (p. 203). Then the area 

 enclosed by our Bathonian- Aalenian lines represents what 

 would be called " Inferior Oolite, g 5," so far as Dundry 

 Hill is concerned ; and the limits which we have laid 

 down may be regarded as =" Inferior Oolite" planned 

 to the best of our ability. Of course only the commence- 

 ment of the Bathonian ^ age is represented by deposits now 

 at Dundry. The deposits of Bajocian age are so incomplete 



^ It must be remembered that we employ the terms Bajocian, Batho- 

 nian, etc., to indicate periods of time. Therefore, the term Bathonian 

 is not applied to the Inferior Oolite, but it is given to that portion 

 of time when rocks were deposited which have been called, according 

 to their lithic, not according to their faunal characters, " Inferior 

 Oolite " in some places, " Fullers' Earth " in others. But these 

 divisions of time take no account at all of lithic characters, they are 

 based solely on paleeontological phenomena. 



