t 4% J 
Jan. 25, i6qq> 
SIR, 
IN Anrvver to your iaft, be pleafed to take the follow- 
ing account , the obfervations which I perfonalljr 
made, were^^ with all the jexa<anefs as the fubjed and 
place would admit. The circuiBfere.nce then, where 
theCe Oyfterrfbells h^ve been digged up, and found , 
contains fas I before hinted^to you J as is )udg*d,betweeii; 
5 and 6 Acres of Land^The foundation of thefe Shells is. 
a hardRockyChalk,and above thisChalk theOyfter-fliells; 
lyc In a bed of green Sand, upon a level, through the 
whole circumfermce, as nigh as can poflibly be judged ^ 
this Stratum of green Sand andOyfter-ftiells is (asl mea- 
fur'djnigh 2 foot deep. Now immediately above this 
Layre, or Stratum of green Sand and Shells, is a bed 
of a bluifh fort of Clay, very hard, brittle, and rug- 
ged, they call it a pinny Glay, and is of no ufe. This 
Bed, or Layre of Clay,T found to be nigh a yard deep ^ 
and immediately above it, is a Stratum of Fullers-earth, 
which is nigh two foot and a half deep 5 this Earth is 
often made ufe of by our Qoathiers : and above this 
Earth is a Bed, or Layre, of a clear fine white Sand, 
without the leaft mixture of any Earth, Clay, a^^c 
which is nigh feven foot deep : then immediately above 
this is a ftiff red Clay, (which is the uppermoft Stra- 
tumj of which we make our Tiles. The deptli of this 
can t be conveniently taken, it being fo high a Hill, 
on the top of which hath, been , and is dug a little: 
common Earth about two foot deep, and immediately 
under appears, this red Clay^that they make Tile§,witli^ 
