304 Prof. Sedgwick on the Classification and Nomenclature 



Kirkby Moor, must represent, in order, the whole Wenlock and 

 Ludlow series. Hence, from the central granite of Skiddaw Forest 

 to the highest tilestone near Kirby-Londsale, there is an ascending 

 section on good parallelism with the whole ascending sections of 

 Wales and the frontier Silurian country. He next compares the 

 two great sections of Wales and Cumberland, &c., by help of two 

 synoptical views, which are as follows : — 



Paljeozoic Rocks of Great Britain. 



^ Permian series. 



t3 I series. 



r 



Devonian series. 



Cambrian series 



Metamorphic, 

 Granite. 



Petherwin group. 

 Caithness group. 



Plymouth group. 



r 



r Silurian Series. ■ 



Ludlow group. 



Wenlock group. 



Caradoc group. 



Bala group. 



Festiniog group. 



Bangor group. 



{Petherwin slate and Cly- 

 menia limestone. 

 Mormand sandstone. 



{Hereford sandstone, marl, 

 and cornstone. 

 Dipterus flags. 



{Dartmouth slate. 

 Plymouth limestone and 

 red grit. 

 Liskeard slate. 



(Upper Ludlow. 

 Aymestry limestone. 

 Lower Ludlow. 



^ Wenlock limestone. 



I Wenlock shale. 



\ Woolhope, or Lower Wen- 

 lock limestone and sand- 

 stone. 



{Caradoc shale ? 

 Caradoc sandstone and 

 limestone. 



C Upper Bala (including 

 I Bala and Hirnant lime- 

 \ stone, shales, flagstones, 

 I and conglomerates. 

 I, Lower Bala. 



Arenaig slates and por- 

 phyry. 

 Tremadoc slates. 

 Lingula flags. 



Harlech grits. 

 Llanberris slates. 



