430 



MISS E. M. R. WOOD ON THE LOWER LUDLOW [May I9OO, 



1400 to 1500 feet. The higher slopes of these are formed of Upper 

 Ludlow strata, capped by Old Red Sandstone, the scenery of which 

 is somewhat bare and desolate. The ground occupied by the Lower 

 Ludlow Beds, on the other hand, is for the most part cultivated or 

 well wooded ; though on the steep slopes of the Aberedw Hills the 

 scenic features produced by the Lower and Upper Ludlow rocks 

 are practically indistinguishable. 



Fiar. 4. 



BU!LTHl)lSmiCT. 



Reference'. 

 lowerLudbow. 

 Werdock, 

 Llandovery. 

 Ordovician. 



These hills give birth to many small streams which cut their 

 way in deep gorges through the hard flaggy rocks, while in the 

 shaly beds the valleys are more open. Many of the deepest gorges, 

 such as those of the Edw and Duhonw, are richly wooded and 

 form picturesque scenery. 



(2) Lithological Characters. 



The Lower Ludlow rocks in the Builth district are somewhat 

 varied in their lithological characters, which on the whole differ but 

 little from those of the underlying Wenlock formation. They 

 consist mainly of dark shales, flags, and mudstones, of varying 

 degrees of hardness. The shales are of a dark greyish-brown, 

 occasionally very thin and papery, but for the most part hard and 



