ARRANGEMENT OF MUSETJMS. 



207 



Table I. The principal divisions of the British Sedimentary Strata. 



rOST-TERTIARY 



I RECENT 

 PLEISTOCENE { 



O 



o 



!2i 



CAIXOZOIC 



OR 



TERTIARY 



Pliocenb 



Miocene 



EOCENE 



MESOZOIC 



OR 



SECOXDARY 



O 

 N 

 O 



CRETACEOUS < 



Jurassic 



Triassic 

 Permian 



DEUTEROZOIC < Carboniferous 



Historic 

 Tre- Historic 



rost-Glacial 



Glacial 



iChillesford beds 

 Norwich Crag 

 Red Crag 

 Ipswich (coralline) Crag 



f Mull leaf-beds, etc. 



( Hempstead beds (Oligocene) 



Bembridge beds 

 Osborne Series 

 Headon Series 



Bagshot Sands 



London Clay 



Oldhaven and Blackheath beds 

 M'voiivich and Reading beds 

 Thanet Sands 



Chalk 



Chalk Marl 



Chloritic Series ( U. Qreensand) 



Gault 



Neocomian (L. Greensand) 

 ^ Wealden 



Oolite 

 Lias 



( Rhsetic 

 -^ Keuper 

 (_ Bunter 



Pernjian 



I Coal Measures 

 Millstone Grit 

 Carboniferous Limestone 



Devonian and 



OLB RED SANDSTONE 



PROTOZOIC 



SILURIAN, or 

 Upper Silurian 



Ordovian, or 

 Lower Silurian 



Cambrian 



EOZOIC 



Archaean 



L 



Ludlow 



IVenlock 



Llandovery 



Bala and Caradoc 



Llandeilo 



Arenig and Skiddaw 



Tremadoc 



Ftestiniog (Lingula flags) 



Menevian 



Harlech and LongmjTid 



Pebidian 

 Arvonian 

 Dimetiau 

 Lewisiau 



