674 MESSES. S. S, BUCKMAN AND E. WILSON [Nov. 1 896, 



In his interesting survey of the Inferior Oolite rocks Mr. "W. H. 

 Hudleston 1 dismisses the Dundry sections in a few words. He 

 says : ' In the present condition of the available exposures it is by 

 no means easy to construct an intelligible section of the Inferior 

 Oolite in this remarkable hill.' The author, however, makes an 

 important observation as to the affinities of the Dundry beds (p. 24). 

 'Both the facies and lithology of those fossiliferous beds recall 

 some of the most typical of the Dorsetshire sections, in spite of 

 their lying well to the north of the Mendips. But, on the other 

 hand, the large development of coral in the ParTcinsoni-zone quite 

 distinguishes this remarkable outlier, which topographically must 

 be included within the second [Cotteswold] district, unless we are 

 to regard it as sufficiently important to constitute a region by 

 itself.' 



In 1889, one of us (S. S. Buckman), 2 following somewhat on 

 Mr. Walker's suggestion, compared both the brachiopods and the 

 ammonites of Dundry, Dorset, and the Cotteswolds. He came to 

 the conclusion that Dundry was more truly an outlier of the Dorset 

 district tban of the Cotteswolds. He theorized as to the manner in 

 which Dundry, during an interval of Jurassic history, might have 

 been cut off from the Cotteswold area. This separation of the 

 areas he supposes might have been brought about by a renewed 

 elevation of Palaeozoic rocks during later Liassic time — such 

 elevation being along the lines of the Mendip axis and of the 

 Tortworth barrier ; and he considers that the result of such 

 elevations would naturally have been to bring the recently-deposited 

 Jurassic rocks of the affected areas sufficiently above sea-level to 

 form barriers cutting off the Dundry area from communication 

 with the Cotteswolds, and the Cotteswolds from Dorset ; but that, as 

 the Dundry strata and their contents are so similar to the Dorset 

 rocks, some direct remains of communication existed between these 

 particular areas; and it was suggested that such communication 

 had been effected around the western end of the Mendip range. 



In the early part of 1892 tbe same writer 3 gave an abridged 

 section of part of the Inferior Oolite of Dundry. He noticed ' the 

 Ironshot,' ' the White Bed below the Ironshot,' and ' the Nodular 

 Bed,' assigning the two former to the Sauzei-zone, and the latter to 

 the concavum-zone. He further correlated 'the White Bed below the 

 Ironshot ' with the Sauzei-bed of Oborne (Dorset) ; but in regard 

 to the exact correlation of ' the Ironshot ' itself he was in some 

 uncertainty. 



In 1893, as one result of the work done by us for the present 

 paper, S. S. Buckman 4 gave an outline-section of the upper part of 



1 ' Gasteropoda of the Inferior Oolite,' Pal. Soc. vol. xl. p. 56, issued for 

 1886. 



2 'The RelatioBs of Dundry with the Dorset-Somerset and Cotteswold 

 Areas during part of the Jurassic Period,' Proc. Cotteswold Nat.F. Club, vol. ix. 

 pt. iv. 1889, p. 374. 



3 ' Inferior Oolite Ammonites,' Pal. Soc. vol. xlv. p. 293, issued for 1891. 



4 ' The Bajocian of the Sherborne District,' Quart. Journ. Geol. Soc. vol. xlix. 

 (1893) p. 508. 



