11^ STRATA IN THE NEIGHBOURHOOD OF LONDON. 



the Isle of Courtagnon, &c.; and they have been jnst shown, incidentallr*. 

 "Wight. to exist ill the Isle of Wight. In an eastern and southern 



direction from London this stratum with its fossils is frequeBt- 

 ly discovered, 

 ihellsabout On the heath near Crayford, about four miles eastward of 



Crayford. Charlton, long vaulted oysters are found sinnilar to those al- 

 ready mentioned. About two miles farther, in the parish of 

 Stone, is Coclde-skell-hank, so called, as Mr. Thorpe, the au- 

 thor of Custumale Rqffeitse, says, p. 254 of that work, *' from 

 •' the great number of small shells there observable." These 

 «re the cyclades already spoken of, and which Mr. John 

 Latham, author of The general Synopsis of Birds, thought 

 bore some resemblance to tellina cornea, Linn., Histor, 

 , " Conchyl. of Lister, tab. 159, fig. 14. Mr. Latham here also 



met with a species of cerithium, and another of turritella. 

 Fragments of these shells are also frequently turned up with 

 the plough in that neighbourhood. They have likewifee been 

 found at Dattford, at Bexley, and at Bromley, to the 

 southward. 

 Large mass of Mr. Thorpe also relates, that, in the parish of Stone, there 

 *'°u^.^"fi was a large mass of stone, of some hundreds weight, full of 

 shells, which was broug^ht from a field, and used as a bridge 

 or stepway over a drain in the farm-yard. (Custumale Rqf^ 

 Jense, p. \i55.) 

 Caursethelly In several spots in the neighbourhood of Bromley, stone 

 mcttone. ^^ found near the surface, formed of oyster-shells, still 

 adhering to the pebbles to which they were attached, and 

 which are similar to those which have been just described, as 

 occurring at Plumstead and at Charlton : the whole being 

 formed by a calcareous cemeot into a coarse shelly limestone 

 containing numerous pebbles. The only quarry of this 

 •tone, which has been yet worked, is in the grounds of 

 Claude Scott, Esq. The opening hitherto made is but 

 small ; it is however sufficient to show, that the stratum 

 here worked has suffered so:«e degree of displacement, a% 

 it dips with an angle of about forty-five degrees. 

 Stratum of At Feversham, over the chalk, Mr. Francis Crow has disco- 



chalk"'^^ ' ''^ ^^'■'^'^ ''^ bed of dark brown sand, slightly agglutinated by a si- 

 liceous cement, and intermixed with a small portion of clay. 

 In this stratum, which has been hitherto but little explored, 



he 



