174 
WILLIAM SMITH : HIS MAPS AND MEMOIRS 
Table of Strata near HLackness showing the Divisions made by 
William Smith and those of the Geological Survey. 
Mr. Smith's Classification. 
Classification adopted by the 
Geological Survey. 
r 
1 
Coralline Oolite - ^ 
I 
f 
i 
1 
Calcareous Grit - ■{ 
1 
1 
1 
I 
Upper Calcareous Grit. 
Upper Calcareous Grit. 
Limestone. 
Upper Limestone and 
Coral Rag. 
Middle Calcareous Grit. 
Lower Limestone with 
Coral Bed at base. 
Spongite Coral Bed. 
Grey or Wallstone. 
Passage Beds or Grey- 
stone. 
Reddish yellow sand. 
Lower Calcareous Grit. 
(The different bands 
noticed, but not classed 
as divisions.) 
Cherty bed of stone. 
Freestone. 
Oxford Clay. 
Oxford Clay. 
Hackness Rock. 
Kellaways Rock. 
Clay. 
Cornbrash with clays 
above. 
Corn brash. 
Coaly Grit. 
Estuarine Series. 
