159 



TAB. CLXXXIII. 



SILEX Talcum. 

 Talc. 



Div. 2. Imitative, in grains. 



When it is found in a state as if it had suffered a change 

 after parting with the original rock, and with the remains 

 of other subjects and animal exuviae, it assumes a new ap- 

 pearance. Thus it is found heaped in abundance in strata 

 that seem to have originated from the fragments of rocks, as 

 in the sandy marie * of many parts of Somersetshire, Wilt- 

 shire, 8cc. 



The upper specimen came from Stourhead near the seat 

 of Sir Richard Hoare, Bart., and was picked up on that 

 gentleman's estate by my friend Charles Mead, Esq. The 

 shell is formed of Lime, and the sand has some fragments 

 of Lime among it, probably more or less composed of 

 broken shells, while the Chlorite is interspersed, forming 

 dark green specks. The shell is curiously divided by five 

 large ridges, between each of which are three smaller ones. 



We take advantage of figuring the perfect and rare 

 remains of this shell, as it may be of future use, perhaps, 

 in settling some geological questions. 



I gathered sand nearly of the same nature at Charlton 

 in Kent, some years since, curiously mottled or stratified 



* The provincial name for this is good, being Green Sand. 



