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GEOLOGY - i n   p r e p a r a t i o n   

 
Formation
 
Stage
Local
reference
 
System
 
Age
million
years
Blown sand, sand and shingle beaches
Alluvium and peat
Tufa
  Holocene or recent 0.00
 
0.01
Head and Coombe Rock with loam
Raised beach Portland
Plateau gravel
Angular Flint Gravel
  Pleistocene 0.01
 
 
1.8
Bembridge Limestone Creechbarrow Lattorfian Oligocene 23.8
 
33.7
Bagshot Beds Cuisian Eocene 33.7
 
 
 
 
 
54.8
London Clay Ypresian
Reading beds Landenian
Upper Chalk Senonian Upper Cretaceous 65.0
 
 
 
 
 
99.6
Middle Chalk Turonian
Lower Chalk Cenomanian
Upper Greensand
Gault
Albian
Lower Greensand
Atherfield Clay
Aptian Lower Cretaceous 99.6
 
 
 
 
 
144.0
Wealdon Beds Neocomian
Purbeck Beds Purbeckian Upper Jurassic 144.0
 
 
 
 
 
 
 
 
 
 
 
 
 
161.2
Portland Stone
Portland Sand
Portlandian
Kimmeridge Clay
Abbotsbury Iron Ore
Kimmeridgian
Corallian Beds
                  (Upper clays)
Oxford
Oxfordian
Clay
                  (Lower shales)
Kellaway Beds
Upper Cornbrash
Callovian
Lower Cornbrash
Forest Marble
Fuller's Earth
Bathonian Middle Jurassic 161.2
 
 
175.6
 
 
 
This table is a temporary construction to pick up what is local to Purbeck and thereabouts and should not be taken as a geological table to encompass the whole of the earth.
 

 

 

 

 

 

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Rev:20050101

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