G. L. Elks — GraptoKte Zones in Arenig Hocks. 201 



Marr also recorded fossils from the old tramway near Pont 

 Seiont on the left bank of the river, but so far as I am aware the 

 beds exposed from Pont Seiont to the mouth of the river have never 

 been described in detail, and since they contain three clearly defined 

 graptolitic faunas the succession is not devoid of interest. 



SLaty 

 Flagstones 



Sandy Shales' 

 witii UmesXone 

 bands s, j-ew/ 

 thin. cLykes 

 of cLiaU-ase 



u 



'c^ Sandy Shales 

 i.^::^^ PUBLIC 



PARK. 



Fig. 1. — Sketch-map of AfoE Seiont below Pont Seiont. Scale, 6 inches = 1 mile, 



(a) Zeft BanJc. 



The beds are first seen below the bridge to the west of the 

 railway, along the cutting made for the Nantlle Tramway, long 



