1826.] Geological Society. 143 



tions made during the spring of 1825 at Tivoli, on the spot 

 where the villa of JVIanlius Vopiscus stood, fragments of granite 

 were discovered, the felspar of which is of a green colour, 

 exactly resembling that which is called Amazonian stone. As 

 this rock was never before known to be among those employed 

 by the ancients, it becomes a curious point, observes the author, 

 to ascertain whence they derived it, since the modern locahties 

 of the Amazonian stone are confined to Siberia and the continent 

 of America. As Egyptian hieroglyphics appear on the original 

 surface of some of these fragments. Lord Compton supposes the 

 green granite to have been found, though as a very rare sub- 

 stance, in Egypt. 



A paper was also read, entitled, " IVotice of Traces of a Sub- 

 marine Forest at Charmouth, Dorset ; by H. T. de la Beche, Esq. 

 FRS. GS. &c." 



A circumstance seeming to indicate the existence of the 

 remains of a submarine forest near the mouth of the Char, was 

 lately pointed out to Mr. De la Beche by Miss Mary Anning. 

 Upon a flat of some extent, stretching into the sea in front of 

 the beach, only visible at low water, and composed of lias, 

 patches of a blue clay show themselves, imbedding pieces of 

 blackened wood lying horizontally, similar in appearance to 

 those usually met with in submarine forests ; some of them are 

 large, but the greater number must have been derived from 

 small trees ; mixed with these are a few hazel nuts, and abun- 

 dant remains of plants, chiefly such as are found in marshy 

 grounds. Angular and blackened pieces of chert and flint, pre- 

 cisely resembling those which occur in the diluvium on either 

 side of the Char, form the substratum of this clay, which has 

 been worn away on most places by the rolling of the large 

 pebbles thrown up by the action of the sea upon the beach. 



Dec. 2. — A paper, entitled, " Remarks on the Geology of 

 Jamaica ; by H. T. De la Beche, Esq. FGS." was read in part. 



A paper was also read, entitled, " An Account of an unde- 

 scribed Fossil Animal from the Yorkshire Coal-field ; by John 

 Atkinson, FLS. and Edward Sanderson George, FLS." 



Dec. 16. — A paper was read, " On the Chalk and Sands 

 beneath it (usually termed Green Sand), in the Vicinity of Lyme 

 Regis ; by H. T. De la Beche, Esq. FGS. &c." 



Mr. De la Beche observes that we ought not to suppose that 

 the sands, marles, and clays, which are immediately subjacent to 

 the chalk in the east of England, can be traced into other and 

 distant countries, where however these sands, &c. as a mass, may 

 be easily recognized. That this cannot be done, even at com- 

 paratively short distances, it is the object of this communication 

 to prove, by examples derived from the chlfs at Lyme Regis, in 

 Dorsetshire, and Beer, in Devonshire; detailed sections of which 



