Vol. 52.] ON THE UPPER PORTION OF DTJXDRY HILL. 709 



with the lower part of the fossil-bed at Sand ford Lane near Sher- 

 borne, and with the Gryphite Grit of the Cotteswolds. The middle 

 part of the Sandford Lane Fossil-bed contains numerous species of 

 Witchellia ; similar species of the same genus are found at Dundry 

 above this Sonninia fissilobata-ovalis horizon, in a bed of different 

 matrix ; and they are found in the Cotteswolds in a bed lithologically 

 different from, and some 12 to 25 feet above the Gryphite Grit 

 (jissilobata-ovalis) : so that the correspondence in this case is very 

 noticeable. Then the upper part of the Sandford Lane Fossil-bed 

 contains a peculiar fauna — consisting of Sonninice of the propin- 

 quans-tjpe, high-keeled species noticeably different from fosilohata 

 — and ' Stephanoceras ' Sauzei, or contractum ; and the same suite 

 of fossils is found at Dundry above the Witcliellia-series in an 

 unmistakably different matrix. No deposit of this date can yet be 

 definitely stated to have been found in the Cotteswolds, yet at Cleeve 

 Hill there is, above the Witchellia-grit, some 25 feet of rock 

 which it is reasonable to suppose was laid down during the Sauzei 

 hemera, simply because of the position which it occupies in the 

 stratigraphical sequence. 1 



Above the Ironshot Oolite — the deposit of the Sauzei hemera — 

 there is at Dundry a non-sequence, just as there is at Cleeve Hill, 

 and at Sandford Lane, near Sherborne ; but at Oborne, near Sher- 

 borne, are found the deposits laid down in this interval ; and these 

 are noted in Table VI., facing p. 704. 



(6) The Strata of Bathonian Age. 



Of the date of the deposit which follows the stratigraphical gap 

 in the sequence of the Dundry rocks we have a certain amount of 

 evidence from contained fossils : it was laid down during the 

 Garantiance hemera. Therefore it is contemporaneous with the 

 Upper Trigonia-grit of the Cotteswolds, which also follows the 

 stratigraphical gap so noticeable in that district ; and it is con- 

 temporaneous with the Freestones of Sherborne (Dorset). 



Of the exact date of the remaining Dundry deposits we have not 

 much evidence. We have, of course, that of their position in the 

 stratigraphical sequence, and we have the brachiopod evidence of 

 the Coralline beds. The inferences to be drawn therefrom we have 

 stated on p. 680, etc. 



In the Freestones and Coralline beds, but in the latter more 

 particularly, there is a considerable amount of siliceous matter 

 which no doubt adds materially to their hardness. There is 

 chalcedony with geodes containing quartz-crystals, as well as 

 incrustations of beekite. 



(7) The Geographical Extent of the Ironshot Oolite. 



The Ironshot Oolite has been found by us only at the northern 

 and southern main-roadside quarries, at Rackledown, at East 



1 S. S. Buckman, 'The Bajocian of the Mid-Cotteswolds,' Quart. Journ. 

 Geol. Soc. vol. li. (1895) p. 461. 



