THE GEOLOGY OF BRIDPORT. 115 



tenacious to furnish a good stone for building. The sand is good 

 for foundry purposes. 



In Down Cliff the beds above the Midford Sands have all been 

 washed away, but just the summit of Thorncombe Beacon shows 

 some of the Greensand which is found in so much greater 

 thickness on Golden Cap, as well as on Eype Down and the more 

 distant heights of Pillesdon and Lewesdon, Stonebarrow, &c. We 

 have, however, only to look across to the other side of Bridport 

 Harbour to see the cliffs crowned and protected by a thin cap 

 of (11) Inferior Oolite. This hard rock, much used for road 

 metal and field walls, furnishes a similar cap for Allington Hill, 

 Sleuse Hill, and Chideock Quarry. It is extremely fossiliferous, 

 especially for mollusks in great variety. 



A very interesting double Fault between Eypemouth and 

 Bridport Harbour has preserved for us a portion of cliff exhibiting 

 the next two strata in our ascending series. Some 400 yards east 

 of Eypemouth we have a down-throw of 425ft., and into the 

 great crack thus opened has fallen a large mass of (12) Fuller's 

 Earth. Half-a-mile further along the coast this is faulted 

 again against the Midford Sands just before we reach the 

 Harbour. For a considerable distance it is capped by (13) 

 Forest Marble, including Bradford Clay, in a bed of which 

 may be abundantly found the characteristic fossil Rliynclionella 

 Boueti. 



Looking away to the east along the Chesil Beach we shall see, if 

 the weather is tolerably clear, the Isle of Portland ; and the 

 Members of the Field Club who came the other day to the summit 

 of Bidgway Hill will not need to be reminded of the admirable 

 view we then had of all the strata the Forest Marble, Cornbrash. 

 Oxford Clay, Corallian Beds, Kimmeridge Clay, Portland Stonej 

 and Purbecks which bring us right to the top of the entire Jurassic 

 System. 



The following sections in the neighbourhood may be noted for 

 the undermentioned strata : 

 Midford Sands Stoke Nap. 



