Yol. 52.] LLANDOVERY AND ASSOCIATED ROCKS OF CONWAY. 



287 



(Lake, Quart. Journ. Geol. Soc. vol. li. 1895, p. 9), the Brathay 

 Flags of the Lake District (Marr, Geol. Mag. 1892, p. 535), and the 

 Riccarton Flags of Scotland. 



Conway. 



Dee Valley. 



Lake 

 District. 



Scotland. 



Wenlock Shale. 



Pen-y-glog 

 Slates. 



Br at hay- 

 Flags. 



Eiccarton 

 Beds. 



Moiwgraptus priodon (Bronn) . 

 vomerinus, Nick 



* 

 * 

 * 

 * 



* 



# 



* 





personatus (Tullb.) 



Cyrtograptus Murchisoni (Oarr.) 



There also occurs at Conway Monograptus fleocuosus, which is 

 Swedish form of Wenlock Shale age. 



4. The Denbighshire Grits and Flags. 



The Denbighshire Grits and Flags, from their position above the 

 Wenlock Shales, are in all probability the equivalents of the beds 

 overlying the Pen-y-glog Slates in the Dee Valley, which Mr. Lake 

 has shown (op. cit.) to be of Lower Ludlow age. 



Approximate Correlation of Beds. 



Conway. 



Central Wales and 

 Western England. 



Lake 

 District. 



Scotland. 



Denbighshire Grits 

 and Flags. 



-r* u- i x.- f Nant-Glyn Flags, 

 Denbighshire 1 Moel 5 Ferna 6 

 Grits and J gla &nd pen _ 



Flag8, I yglogGnt. 



Coldwell Beds. 





Wenlock Shales. 



Wenlock Shales (Pen-y-glog Slate). 



Brathay Flags. 



Riccarton Flags. 



(Upper beds absent.) 

 Tarannon Shales. 



1. Zone of Eetiolites Geinitzianus, 



G. Grayce. 



2. Zone of Monograptus turricula- 



tus f M. exigmis, etc. 



Upper Browgill 



Beds. 

 Lower Browgill 



Beds. 



Upper Gala 



Beds. 

 Lower Gala 



Beds. 



Upper Llandovery 

 Beds. 



Llandovery Beds of Cardigan and 

 Dee Valley. 



Upper Skelgill 

 Shales. 



Upper Birkhill 

 Shales. 



