42 INTRODUCTION. 



(3. Pliocene System. — (British representatives, the Norwich 

 Crag, and the Red and White Crags of Suffolk.) 

 4. Miocene System. — (The Upper Miocene or "Falunian" 

 series and the Middle Miocene or " Mayencian " series are 

 wanting or doubtfully represented in Britain. The Lower 

 Miocene series is often grouped with the Upper Eocene 

 series as a separate system, under the name of Oligocene, 

 n g represented in Britain by the Hempstead, Bembridge, 



£ ^ Osborne, and Headon beds.) 



^ H 5. Eocene System. — (British representatives, the Barton Clay, 

 W Bagshot and Bracklesham beds, London Clay, Thanet 



\ Sands, &c.) 



pk ( 6. Cretaceous System. — (British representatives, the Chalk, 



§ the Upper Greensand, the Gault, the Lower Greensand, and 



p* the Wealden Clays and Hastings Sand. The Lower Green- 



^ sand and Wealden series are commonly grouped together 



£j as the " Neocomian" series.) 



< 7. Jurassic System. — (British representatives, the Purbeck 



£ beds, Portland beds, Kimeridge Clay, Coral Rag, Oxford 



g J Clay, Cornbrash and Forest Marble, Great Oolite, Stones- 



w \ field. Slate, Fuller's Earth, Inferior Oolite, and Lias.) 



. Triassic System. — (The uppermost Triassic or " Rhaetic " 



o beds are feebly represented in Britain by the Penarth beds 



o and White Lias, and the " Keuper " and " Bunter Sand- 



o stein " of the continent of Europe have corresponding 



o British representatives. The great marine division of the 



a " Muschelkalk," which is largely represented in the Trias 



§ V of Germany, is not developed in Britain.) 



9. Dyas or Permian System. — (The deposits included under 

 this name are more extensively developed in the European 

 area than they are known to be in any other region, and it 

 is doubtful if they can be regarded as a distinct " system." 

 The chief British representatives of the Permian rocks are 

 the Marl-slate and Magnesian Limestone, or "Zechstein," 

 and the Penrith Sandstones or " Rothtodtliegendes.") 

 g 10. Carboniferous System. — (British representatives, the Coal- 

 o measures, the Millstone Grit series ; the Yoredale series, 



^ the Scar - limestone series, and the Tuedian or Cement- 



limestone series.) 

 n. Devonian System.- — (The Devonian rocks of Devonshire 

 n are marine, and contain representatives of the Lower, Mid- 



13 die, and Upper Devonian of the continent of Europe. The 



j Old Red Sandstone of Scotland and of South- Western Eng- 



^ land and Wales was perhaps deposited in inland waters.) 



12. Silurian System. — (British representatives, the Ludlow 

 series, Wenlock series, and May Hill series.) 



13. Ordovician System. — (British representatives, the Bala 

 series, the Llandeilo series, and the Arenig series.) 



14. Cambrian System. — (British representatives, the Tremadoc 

 series, the Lingula Flag series, the Menevian series, and the 

 Harlech series.) 



'S) 



