190 



MR. L. J. WILLS OX LITE aLACIAL AND [JuilG I912, 



fig. 2). But at this point the Morlas Brook has been captured in 

 post-Glacial times by a tributary of the Ceiriog, as is M^ell shown 

 in the accompanying map. It will be seen that the width of 



alluvium in the Morlas Valley above Esgob Mill corresponds with 

 that in the deserted valley near St. Martin's Moor, while the present 

 lower part of the Morlas Brook flows in a gorge. Further, a small 

 obsequcnt stream, rising in an artificial ditch at St. Martin's ]\[oor, 



