346 SEMI-PANORAMIC VIEW OF THE SILURIAN AND OLD RED SYSTEMS. 



South Wales (see p. 169, et seq.), and in the middle ground the Silurian System, ap- 

 pearing prominently in the escarpment of Mynidd Epynt, whence it extends north- 

 eastward to Radnor Forest, and south-westward into the hills near Llandovery. The 

 valley in which the Yrfon and the Wye meander, through beds of soft schist and 

 shale, is well expressed by the artist ; while the bright red colours indicate the 

 ridges of eruptive rock which have been described in this and the preceding chapter. 



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