58 MESSES. W. E. ANDEEWS AND A. J. JUKES-BEOWNE [Feb. 1894, 



compared with that of the cutting south of Teffont (p. 55), it will be 

 seen that the succession is similar for about 6 feet above the ArcJia'- 

 oniscus-bed : the variations are only such as might well occur in 

 the space of a mile, and are probably in part due to the individual 

 layers being differently grouped by ourselves. South of Teffont 

 cutting, however, there is a whitish limestone succeeded by about 

 4 feet of marly clay, followed by yellow sand ; at first sight we took 

 the clay and sand to be the same as those of the Dinton cutting, 

 and inferred that the whitish limestone had thinned out eastward, 

 but subsequently we saw reason to doubt this correlation on the 

 following grounds. 



In the wood south-east of the quarried cutting near Dinton there 

 are old stone-workings now overgrown, but at the bottom of this 

 wood the Ai-cJia>oniseus-bed and the overlying sandy laminated lime- 

 stone crop out in the river-bank near the sluice-hatches. They 

 are doubtless carried down to this low level by the south-easterly 

 dip ; but, in order to see what beds could have been quarried here 

 above the Archceoniscus -limestone, we had a trench cut down the bank 

 of the old quarry on the north-eastern edge of the wood, and in this 

 were exposed the following beds : — 



Feet. Inches. 

 Yellow and grey sand, with lumps of brownish calcareous sand- 

 stone containing Cyrena and Melanopsis ; thin layers of grey 



clay occur in the lower part, which passes down into the next... 2 

 Stiff grey clay, with thin layers of grey sand and thicker layers of 



yellow sand 1 



Stiff grey clay, yellowish near the base ,... 2 



Hard, whitish, silty limestone, breaking vertically into sharp 



splintery fragments 5 



Soft, buff-coloured, shaly marl with Cypridea punctata 7 



Hard, buff-coloured, grey-hearted, sandy limestone 7 



Flaggy and shelly stone, with layers of ' beef ' 4 



Grey marly clay, with layers of whitish shell-marl 1 



Sandy and shelly limestone with Cyrena 4 



Floor of hard stone. 



S 3 



These beds are quite different from any exposed in the railway- 

 cuttings near by ; but the hard, whitish, splintery limestone is not 

 unlike the whitish limestone which occurs about 8 feet from the top 

 of the deep cutting south of Teffont (p. 55). We are strongly inclined 

 to think that the beds visible in the trench are the equivalents of those 

 seen at the top of the above-mentioned cutting, and that they lie below 

 the thick blue clay and yellow sand of the Dinton cutting, being 

 there cut out by a fault, which crosses the railway-line where the 

 stone beds end abruptly. If this be so, the thickness of the strata 

 between the Archceoniscus-limestone and the thick blue clay is some 

 8 or 10 feet greater than it appears to be in the Dinton cutting, 

 and these beds must be added to the Middle Purbeck group. 



