iffcs. NORFOLK. 193 



however, is of a much ihallowerfoil, not deeper 106. 

 than the plow goes , and its prefent very FLEG CLAY. 

 amazing fertility he afcribes in a great meafure, 

 to his having clayed it. Indeed to this fpecies 

 of improvement the fertility of the Fleg Hun* 

 dred is allowed to be principally owing* 



Mr. F. gave me an opportunity of examin- 

 ing his clay-pit ; which is very commodious; 

 the Uncallow is trifling, and the depth of the 

 bed or jam he has not been able to afcertaim 

 It is worked, at prefent, about ten or twelve 

 feet deep. 



The colour of the foffil, when moift, is a 

 dark-brown, interfperfed with fpecks of white ; 

 and dries to a colour lighter than that of ful- 

 ler's earth ; on being expofed to the air it breaks 

 into fmall die- like pieces. 



From Mr. F.'s account of the manner of its 

 afting, and more particularly from its ap- 

 pearance, I judged it to be & brown marl, rather 

 than a clay ; and, on trying it in acid, it proves 

 to be ftrongly calcareous; eifervefcing, and 

 hiding, more violently than moft of the white 

 marls of this neighbourhood : and what is flill 

 more interefting, the Hemsby clay is equally 

 turbulent in acid, as the Norwich marl; which is 



VOL. II. O brought, 



