248 PKOP. C. LLOYD MORGAN ON THE PEBIDLiN 



is broken by a considerable fault, whicb brings the conglomerate to 

 the shore-line. This fault is entered in Dr. Hicks's map ; but I 

 have not seen any evidence for the second fault he draws, making 

 a V with this one. Inland of the fault and on its southern side the 

 conglomerate is well exposed in the field, so that the amount of 

 displacement, 175 yards, can be readily measured. North of the 

 fault the well-developed mass of cod glomerate then runs roughly 

 parallel with the shore-line (though it is thrown seawards by one 

 or two minor step-faults), striking IN". 35° E., with a dip of from 

 55° to 45°. At the southern end of Whitesand ]3ay, at Ogof 

 Golchfa, the underlying Pebidians are exposed for a short distance, 

 when another strongly-marked fault briogs in higher beds of the 

 Cambrian series. 



Dr. Hicks figures the junction at Ogof Golchfa as if it showed a 

 marked unconformity (I. c. p. 543, fig. 15). The figure is, how- 

 ever, misleading. The conglomerate ends off against the Pebidian 

 with a faulted junction, as noted by Mr. Blake. The edges of the 

 conglomerate are truncated wedge-fashion, as shown in the accom- 

 panying sketch (fig. 4), taken from the cliff so as to look down on 



Fig. 4. — Faulted junction of Conglomerate and Pebidian 

 at Ogof Golchfa. 



Sketched at high-water from the cliff, looking down in the direction 

 of dip of the conglomerate. 



the line of dip of the strata. Near the base of the cliff, however, 

 the slip has taken place in such a manner as to leave some of the 

 red Pebidian adherent to the conglomerate, and here they end off 

 against the conglomerate, making with it an angle of perhaps 5°. 

 A little further north, where the big fault brings in higher beds of 

 the Cambrian succession, some of the conglomerate is in contact 

 with the underlying Pebidian, and appears to be quite conformable 

 with them. 



