UPPER AND LOWER. 



11. 



Note.- We insert the following table of the Upper and Lower Silurians 

 as^they are now subdivided, with fish descending to the Lower Ludlow 

 WtJ are indebted for it to the Rev. Mr Symonds of Pendock.— L. M. 



Upper Ludlow. 

 Aymestry Limestone. 

 Lower Ludlow. 



Wenlock Limestone. 



Wenlock Shales and Wool- 

 hope Beds. 



Llandovery Rocks, Upper ) 

 and Lower. ( 



Caradoc or Bala Rocks 



Llandeilo Flags. 



Lingula Flags. 



Cambrian Rocks. 



10 



Fish, 1838, (Murchison). 

 None found. 



Fish, 1859, (Mr Lee of 

 Caerleon). 



Fish, none. 



none. 



