A GEOLOGICAL TIME-SCALE, WITH EXAMPLES OE POSSILIEEEOUS ROCKS. 



PIEISTOOEITE 

 PLIOCENE . 



FEEOUS. 

 DEVONIAN 



CAMBEIAN 



PEEOAMBEIAN 



PRESENT DA 



HISTORIC. 



NEOLITHIC. 



PALEOLITHIC 



TOETONIAN 

 HELVETIAN 

 BUKDIGALIAN 

 AQUITANIAN 



BAKTONIAN 

 LUTETIAN . 

 YPEE.SIA1J . 

 LANDENIAN 



MONTIAN . 

 DANIAN . . 

 SENONIAN . 

 TUEONIAN . 

 CENOMANIAN 

 ALBIAN . . 

 APTL4N . . 

 BARREMIAN 

 NEOCOMIAN 



OXFORDIAN 

 CALLOVIAH 

 BATHONIAN 

 BAIOCIAN . 

 AALENIAN . 

 TOARCIAN . 

 PLIENSBACHIAN 

 SINEM0EIAN 



WENLOCKIAN 



OLENIDIAN 



PAKADOXIDIA 



OLENELLIAN 



, Wexford Gravels. 



Osborne and Headon 

 BartMi and Bagahot. 



London ; Thanet Sands 



1 Norfolk and ChariDg detritus 



Lower Chalk ; Chalk Marl 

 Upper Greeusand ; Red Chalk ; Gault 

 Lower GreeiiBand 



Speeton Clay ; Tealby Beds 



Portland Stone and Sands 

 Kimmeridge Clay 



Corallian Limestone ; Ampthill Clay 

 Oxford 



'. irand*^' 

 II Purbecl 



Oxford Clay 

 Kellawaya Eoc 

 Cornbrash ; Forest Marble ; Great Oolite 

 Middle Inferior Oolite . 

 Cheltenham Beds; Northara] 

 Upper Lia3, Cotteswold 



Cleveland Ironstone 



Wliite Lias, Penarth Beds 

 Waterstones, Elgin Sandstone, Tea-green 

 Pebble Beds, Variegated Sandstone, 



Red Marls and Sandstones, Penrith I 



Taraunon and Llandovei-y Series 

 Bala, Chirbury and ( 



3 most part obscure, i 



RELATIVE LENGTHS OF EPOCHS 



AS REPRESENTED BY THICKKESS OF ROCKS. 



CRETACEOUS. 2,500 f I 



TRIASSIC. 3,000 ft. 



CARBONIFEROUS. 



CAMBRIAlf. 



PRECAMBRIAN. 



Extent unknown. 



