Quart.  Joum.  Geol.  Soc.  vol.  xlix.] 
[To  face  p.  508. 
Table  II. — Diagrammatic  Table  showing  the  Thickness  of  Deposit  at  various  times. 
Horizontal  scale  (in  half-miles)  1  inch  =  1  mile.  Vortical  scale  (in  feet)  1  inch  =  5  feet  (1  cm.  =  2  feet). 
Fusccb  and  zigzag  =  a. 
8 
fH 
CD 
a ' 
CD 
a 
Truellii  =  /3. 
Garantiaiue  =  y. 
Niortensis  and  Humphriesiani  =  o. 
Sauzei  and  Witchellia  sp.  =  e. 
Discitce  and  concavi  =  £. 
Bradfordcnsis  and  Murchisonce  =  rj. 
Molluscan  headquarters  (most  fossili- 
ferous  localities)  =  O- 
The  best  fossiliferous  localities  of 
r]  and  a  are  west  or  south-west  of 
-  the  district. 
