402 GEOLOGY OF THE ISLE OF PORTLAND. 



Sandfoot Castle, the CoraWmj is full of shells and corals. A fine 

 spiral univalve, the Nerinea Goodhalli (Geol. Trims, vol. iv. 

 pi. xxxiii. fig. 12) is found here. 



Near Black-rock, half a mile from Weymouth, the Oxford clay 

 abounds in fossils, which can, however, only be procured by 

 digging through a bed of alluvial soil, two feet thick. 



The upper bed of Portland oolite, called the "Roach" is a 

 congeries of casts of Trigonice, Perna, Terebree, Ammonites, 

 Lucinee, &c. Scales and teeth of a species of Lepidotus are 

 sometimes found in the Portland stone. 



Magnificent Septaria, veined with calcareous spar, are found in 

 the Oxford clay, and are cut and polished for tables, slabs, &c* 



With this brief account of the Isle of Portland 

 and its petrified forest, these Excursions must 

 terminate. To the Geologist, this unpretending- 

 volume will, I fear, present but little of novelty or 

 interest, and probably be useful only as a guide to 

 the most important localities ; but to the General 

 Reader, who may be induced to visit and ex- 

 plore the " Beautiful Island," and the picturescpac 

 scenes described in the preceding pages, I would 

 fain hope that it may prove a source of pleasure 

 and instruction, by opening to his mind new and 

 inexhaustible fields of inquiry, replete with objects 

 of surpassing interest, and which the uninformed 

 and incurious tourist would pass by unnoticed or 

 disregarded. 



* A fine collection may be seen at the establishment of Mr.Ragget, 

 Statuary, on the Smith 1'arailu, Weymouth. 



