PLATE TX 
different kinds of mail-stones . 
Fy. 3 . 
J-:drn r r/n/..ln>,r. VoI.V/j. 327 . 
C D Ideal representation- of do 
, . original extent of The, Formation. 
[> (' Text supposed U) rtai'e been destroyed 
( B ]) Section of die chain as it appears at present 
f j>. 353. J 
Transverse Section of tiie chain of die, Tvrenees intended to 
shew the degradation it is supposed to have experienced - 
TutPsTied try A Constable H C?Idin r 1S2X . 
Kp -9. 
