26o 



OUR COMMON BRITISH FOSSILS. 



Fuller's earth at Langton, five miles west of Wey- 

 mouth, contains plenty of small elongated fossil 

 oysters, Ostrea acinnmata. The Forest marble of the 

 neighbourhood yields Avictda, Linia^ Pholadomya^ 

 Pecten, Trigonia, Myaciies, Turbos, Eiilimas, etc. In 

 the quarry at Well Down, Ostrea Sowerbyi and 

 Avicula costata are especially common. 



The stony cliffs of the back-water channel near 

 the village of Radipole are com- 

 posed of Cornbrash, crowded with 

 bivalves and univalves, the com- 

 monest being Pholadomya bu- 

 cardmm and Avicula edimata. 

 There are numerous quarries in 

 the neighbourhood where similar 

 fossils may be obtained. 



The beautiful Vale of W^ar- 

 dour, Wiltshire, has long been 

 famous for its yield of Oolitic 

 fossils, and the geological structure of the district 

 has been described in the "Transactions of the 

 Geologists' Association." Among the commonest of 

 the fossils belonging to the classes we are now 

 considering are Cerithium Portlandicum, and other 

 species of this genus of univalves ; several species of 

 Trigonia, Ostrea, Cardiiim dissimile, etc. The neigh- 

 bourhood of Swindon is richly fossiliferous, Trigonia, 

 Lima, Ostrea, and Perna being very common. The 

 Upper Oolites continue into Buckinghamshire, where 



Fig. 241. — Hippopodmm 

 ponderosum (Oolite). 



