PRIMARY OR PALAEOZOIC. SECONDARY OR MESOZOIC. CAINOZOIC. 
TABLE OF STRATIFIED ROCKS. 
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SYSTEMS. 
RECENT 
PLEISTOCENE 
(250 ft.) 
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PLIOCENE 
(100 ft.) 
MIOCENE 
(125 ft.) 
EOCENE 
(2,000 ft.) 
CRETACEOUS 
(7,000 ft.) 
NEOCOMIAN 
JURASSIC 
(3,000 ft.) 
TRIASSIC 
(3,000 ft.) 
PERMIAN or 
DYAS 
(500 to 3,000 ft.) 
CARBONIFEROUS 
(12,000 ft.) ( 
DEVONIAN & OLD ( 
RED SANDSTONE 
(5,000 to 10,000 ft.) 
SILURIAN 
(3,000 to 5,000 ft.) 
ORDOVICIAN 
(5,000 to 8,000 ft.) 
CAMBRIAN 
(20,000 to 30,000 ft.) 
EOZOIC— 
ARCHAEAN 
(30,000 ft.) 
FORMATIONS. 
Terrestrial, Alluvial, Estuarine, 
Marine Beds of Historic, 
Bronze, and Neolithic Ages 
Peat, Alluvium, Loess 
Valley Gravels, Brickeartlis 
Cave-deposits 
Raised Beaches 
Palaeolithic Age 
Boulder Clay and Gravels 
LIFE- PERIODS. 
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Norfolk Forest-bed Series 
Norwich and Red Crags 
Coralline Crag (l)iestian) 
(Eningen Beds Freshwater, &c. 
Fluvio-marine Series (Oligocene) 
Bagshot Beds I (Nummulitic Beds) 
London Tertianes J ' ' 
Maestricht Beds 
Chalk 
Upper Greensand 
Gault 
Lower Greensand 
Wealden 
Purbeck Beds 
Portland Beds 
Kimmeridge Clay (Solenhofen Beds) 
Corallian Beds 
Oxford Clay 
Great Oolite Series 
Inferior Oolite Series 
Lias 
Rhaetic Beds 
Iveuper 
Muschelkalk 
Bunter 
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Red Sandstone, Marl ) 
Magnesian Limestone, &c. j 
Red Sandstone and Conglomerate 
Rothliegende 
Zechstein 
Coal Measures and Millstone Grit 
Carboniferous Limestone Series 
Upper Old Red Sandstone 
Devonian 
Lower Old Red Sandstone 
Ludlow Series 
W'enlock Series 
Llandovery Series 
May Hill Series 
Bala and Cara doc Series 
Llandeilo Series 
Llanvirn Series 
Arenig and Skiddaw Series 
Tremadoc Slates 
Lingula Flags 
Menevian Series 
Harlech and Longmynd Series 
Pebidian, Arvonian, and Dimetian 
Huronian and Laurentian 
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