Xlll 



Triassic 



IRhastic Series 

 Keuper Series 

 Muschelkalk (not found in England) 

 Bunter Series 



Palaeozoic or Primary 



t, f Magnesian Limestone Series 



Permian J ° 



( Sand 



J Upp( 



Sandstones, etc. 



Carboniferous 



I 



J Coal Measures 

 I Millstone Grit 



Lower... Carboniferous Limestone Group 



Devonian and t Upper 

 Old Ked \ Middle 

 Sandstone ^ Lower 



Downtonian 



Series 



Silurian 4 Salopian 



Series 



Valentian 

 Series 



Downton Sandstone 

 Upper Ludlow Beds 

 Aymestry Limestone 

 Leintwardine Flags 



Lower Ludlow Beds 

 Wenlock Limestone 

 Wenlock Shale 

 Woolbope Beds 



j Tarannon Shales 

 | Llandovery Beds 



{ Bala or Caradoc Series 



Ordovician \ Llandeilo Series 



i Arenig Series 



j Tremadoc Slates 



Cambrian 



Upper . 



Middle. 

 Lower , 



i Lingula Flags 



| Menevian Beds 



| Solva Beds (upper part of Harlech Beds) 



Olenellus Beds 



