UPPER PORTION OF DUNDRY HILL. 217 



4. The Strata of the Aaleman Age. 



At Dundrj there is evidence, in a grey stone at the base 

 of the limestones of the so-called " Inferior Oolite," of a 

 deposit containing ammonites of the Graviinoceras-aaleiise 

 type, contemporaneous with the upper part of the Cotteswold 

 Cephalopod-bed. 



After this there is evidence of deposition during the 

 Murchisonce hemera, but we have little testimony as to any 

 during the hr adfordensis hemera ; this is partly owing to the 

 w^ant of exposures and partly to the intractable nature of 

 the rock. 



5. The Strata of the Bajocian Age. 



The deposits made at Dundry during the Bajocian AgQ 

 are noticeable for the large number of ammonites w^hich 

 they yield. Four distinct ammonite faunas may be noted, 

 and the change, even as regards genera in the composi- 

 tion of these faunas, is very marked. 



Another point calls for attention, viz., that during this 

 age there evidently was a gradually-increasing supply of 

 iron salts, because the later the deposit the more ironshot 

 is the rock found to be. This character is so noticeable 

 in the deposit of the Sauzei hemera, that that rock has 

 obtained the name of " the Ironshot Oolite." 



The geographical extent of the Ironshot Oolite is very 

 limited ; but that is, in our opinion, on account of events 

 which happened subsequent to its deposition. As to its 

 extension, w^e may note that it has only been found at 

 the northern and southern roadside quarries, at Rackle- 

 down, at East Dundry, and half-a-mile to the east thereof. 

 It is known to be absent from Clements' Yard, Barns Batch 

 Spinney, and Maes Knoll. Therefore in a westerly direc- 



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