A GEOLOGICAL TIME-SCALE, ^ 



Eras. 



Epochs. 



HOLOCENE . 



PLEISTOCENE 



PLIOCENE 



MIOCENE 



OLIGOCENE 



EOCENE 



CRETACEOUS 



JURASSIC . f 



TRIASSIC 



PERMIAN 



CARBONI- 

 FEROUS. 



DEVONIAN 



SILURIAN 



ORDOVICIAN 



CAMBRIAN 



PRECAMBRIAN 



AGES. 



PRESENT DAY 



HISTORIC. 



NEOLITHIC. 



PALJilOLITHIC 

 GLACIAL . . 



SICILIAN . 

 ASTIAN . . 

 PLAISANCIAN 



TORTONIAN 

 HELVETIAN 

 BURDIGALIAN 

 AQUITANIAN 



RUPELIAN . 

 TONGRIAN . 

 PRIABONIAN 



BARTONIAN 

 LUTETIAN . 

 YPRESIAN . 

 LANDENIAN 



MONTIAN . 

 DANIAN . . 

 SENONIAN . 

 TURONIAN . 

 CENOMANIAN 

 ALBIAN . . 

 APTIAN . . 

 BARREMIAN 

 NEOCOMIAN 



PORTLANDIAN . 

 KIMMERIDGIAN . 

 CORALLIAN . . 

 OXFORDIAN . , 

 CALLOVIAN . . 

 BATHONIAN . . 

 BAJOCIAN . . . 

 AALENIAN . . . 

 TOARCIAN . . . 

 PLIENSBACHIAN 

 SINEMURIAN . . 

 HETTANGIAN . . 



RHAETIAN . 

 KEUPERIAN 

 CONCHYLIAN 



THURINGIAN 



PUNJABIAN 



ARTINSKIAN 



OURALIAN . 

 MOSCOVIAN 

 BERNICIAN 



CONDRUSIAN 

 EIFELIAN . 

 COBLENTIAN 



LUDLOVIAN . 

 WENLOCKIAN 

 VALENTIAN . 



CARADOCIAN , 

 LLANDEILIAN. 

 ARENIGIAN . 



OLENIDIAN . 

 PARADOXIDIAN 

 OLENELLIAN . 



CHS 

 ROCKS. 



Norfolk Forest' 



Norwich and R 

 Coralline Crag 



Ham stead 

 Bembridge 

 Osborne and H 



Barton and Ba; 

 Bracklesham 

 Alum Bay Beds 

 London Clay 



Chalk in Norfo] 

 Upper Chalk 

 Middle Chalk 

 Lower Chalk ; ( 

 Upper Greensa 

 Lower Greensai 

 Atherfield Clay 

 Speeton Clay ; ' 



Portland Stone 

 Kimmeridge CI 

 Corallian Limes 

 Oxford Clay 

 Kellaways Rod 

 Cornbrash ; Fo 

 Middle Inferior 

 Cheltenham Be 

 Upper Lias, Col 

 Mid Lias, Marl 

 Lower Lias 



„ Blii 



White Lias, Pei 

 Waterstones, E 

 Pebble Beds, V 



Magnesian Lim 

 Red Marls and 



Coal Measures 

 Millstone Grit 

 Mountain Lime 



Upper Devoniai 

 Middle 

 Lower , 



Downton and I 

 Wenlock and ^ 

 Tarannon and 1 



Bala, Chirbury 

 Llandeilo and B 

 Arenig, Shelve 

 Tremadoc and 

 Lingula Flags 

 Menevian Serie 

 Harlech, CaerfE 



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