SOUTH LANCASHIRE, CHESHIRE, AND TFIE WELSH BORDER. 375 



great Bala fault near Minera. The projecting quartz pebbles are 

 splintered on those sides which face the west, and have small 

 ridges running towards the east, as though the glaciation had taken 

 place from the west. At three miles distance, on Hope Mountain, 

 there are striae running nearly at right angles to those of Gwern-to, 

 their direction being I*^. 15° W., at a height of 530 feet above the 

 sea. Mr. Mackintosh* mentions strice in this locality bearing iS".W., 

 but notices that at Corwen and Glyndyfrdwy they run from the 

 '\V.S.\Y. The same direction has been observed in this locality by 

 Prof. Hughes, who has also remarked striae at Bryngorlan at the 

 south end of the vale of Clwyd, ranging from a little north to a little 

 south of east. In the Yale of Llangollen and on the high ground 

 forming its north side striae are stated by Mr. Morton t to run east 

 and west at an elevation of 1200 feet, and at Llan-y-mynech to run 

 jN'.E. and S.W. It will be noticed that all the striae referred to 

 above, excepting those on Hope Mountain, fall into the I*[.E. quarter 

 of the compass. Those on Hope Mountain, on the other hand, 

 together with some at Hawarden recently noticed by Mr. De Kance, 

 coincide very closely with the direction of the main glaciation of 

 Liverpool. 



Returning to the north, striae are found near Gwaenysgor, in the 

 same neighbourhood as those of Moel Hyraddug, and also at a high 

 elevation (viz. 660 feet), but running I^. 5° W. ; and again at the foot 

 of a steep rocky cliff called Craig Fawr, overhanging the Talargoch 

 mine, and facing west, there occur striae running horizontally round 

 a projecting shoulder of limestone towards the south, the direction 

 in this case being indicated by the fact that the north sides only of 

 the prominences of the rock are striated. In these two instances 

 also the striae appear to coincide with the principal set of Liverpool. 



Two other instances have been observed in this district, namely 

 at Ehuallt, near St. Asaph, where the striae run W. 27° S., and in 

 the Coed-nant-y-wrach, near Caerwys, where they run IN". 20° W. ; 

 but in both cases the direction of the striae has been determined by 

 that of the deep and narrow ravines in which they are situated. 



On the west side of the Yale of Clwyd, they have been noticed 

 by Prof. Hughes at Cefn, near St. Asaph, with the direction E.N.E. ; 

 and proceeding along the coast westwards, we find them in several 

 spots near Llandulas. They have been observed by Mr. Tiddeman in 

 the valley of the Dulas, on the jS'.W. spur of Cefn-yr-ogof, to run 

 N. 12° E., and on the nearly level plateau above the limestone cliff 

 over the station I found them pointing N.E. and N. 30° E. The 

 brow of limestone forming the eastern entrance to the Craig (or 

 Penmaen) tunnel is glaciated in a direction N. 10° W., and on the 

 point above the tunnel they run N. 10° E. In the two last-named 

 cases the striae occur on nearly vertical rock-faces, the precise 

 direction therefore depending upon that of the cliff'. 



At the Great Ormes Head the striae run horizontally along, and 

 straight down, a steep slope facing south-east, so as to cross obliquely 



* Quart. Journ. Geol. Soc. vol. xxx. 1874. 



t Proc. Liverpool Geol. Soc. sess. 17, 1875-76. 



Q. J. G. S. No. 167. 2 D 



