GEOLOGY OF THE BRISTOL COALFIELD. 279 



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PART 5. JURASSIC STRATA, 



DuNDRY Hill. 



THIS hill having an altitude of nearly 770 feet above the mean 

 sea level, is an important locality for the study of Jurassic 

 Geology. It is an outlier of the Cotswold range. Based upon the 

 Keuper Marls of the triassic system, a complete epitome is formed 

 of Rhaetic and Jurassic strata for the Bristol student. Very good 

 sections of all the most characteristic divisions may here be found 

 and studied, in situ, or more extensively displayed in rnany places 

 in the immediate neighbourhood of Bristol. Fortunately the dip of 

 the Oolitic beds, which form the cap of the hill, lies in nearly the 

 same plane as the turnpike road, so that their examination may be 

 more easily made. It will be noticed that the fossil fauna are both 

 peculiar as well as numerous. Such a state of things is invariably 

 seen wherever an island is situated near, and contemporaneously 

 formed with a main shore. For instance, at Caldy Island very near 

 Tenby, many of the same shells may be found at both places, but 

 a few of them are to be especially found at the island, while others 



