9 



position. Til is accounts, in some measure, for the difference in the 

 depths of the quarries in which are worked the same vein of stone. 

 For instiince, of the two by the side of the road leading to Worth, and 

 which are not more than thirty paces apart, the one is forty feet deep, 

 and the other only twenty-five feet. 



We now return to Swanage, and following the narrow foot-path along 

 the south shore of the bay, immediately beneath Peverel House, we 

 find the comminuted shell limestone dipping beneath the sea, all the beds 

 above it being gone. At the end of the wall the Unio bed is exposed, 

 and the low bank between this spot and the Preventive Station presents 

 tlie following section : — 



Feet. Inches. 

 1. Yellow MarlR, with a band of hard shales, containing 



Cypris and small Paludina 3 



( Soft Shales "\ 



„ J Bands of fibrous Carbonate of Lime I 12' 



"1 Hard and sandy Shales^ containing a long bivalve j "* 

 VSoft yellowish Shales ) 



3. Hard green coloured Bed, with Unios 6 



4. Soft, do S 



6. Light-coloured Marl, containing a long bivalve 4 



7. Pinkish shaly Marl 2 



8. Band of Marble 9 



9. Grey Marl 



These beds are much distorted, and disappear beneath the station. 

 At Peverel Point, the comminuted shell limestone is disturbed by a 

 fault as mentioned above. Turning into Durdlestone Bay, and com- 

 mencing with the lowest part of the cliflT at the spot where a flight 

 of stone steps descend from the Flag Staff to the shore, the Purbeck 

 beds are found to rise from beneath each other in the following 

 order : — 



DURDLESTONE BAY. 



Thicknegg. Organic Reinaing. Quarry List 



