"Vol. 67.] WORCESTER, ROBERTSON, AND ASHTON (CAPE COLONT). 719 



Small isolated patches of Dwyka and Ecca rocks are also seen 

 close to the town of rtobertson, and especially along the railway 

 and in the low hills immediately north of it. There is a good 

 exposure of typical Dwyka Conglomerate near the water-mill to 

 the north-west of the town, at the month of Wolve Kloof. These 

 rocks are normal, and require no further description. 



IX. The Enon Conglomerate. 



One of the most important formations for the purpose of the 

 present investigation is the Enon Conglomerate. It is unnecessary 

 here to recapitulate the evidence on which this deposit has been 

 correlated with the marine Cretaceous strata of the Uitenhage 

 Series : this correlation may be taken as fully established. Within 

 the area here dealt with, almost all the deposits of this age are of 

 a terrestrial and torrential character, and were apparently formed 

 under conditions very similar to those now prevailing in the 

 district. At any rate, it is sometimes difficult to distinguish the 

 more weathered portions of the Enon Conglomerate from the coarse 

 gravels of recent and subrecent origin which cover such great areas 

 in the valleys and lower parts of the district. A careful examination, 

 however, shows that the character of the pebbles is different : that 

 is to say, they have been derived for the most part from different 

 formations, as will later be explained in detail. 



In the district under consideration there are three disconnected 

 patches of Enon Conglomerate : a small one north-west of Wor- 

 cester, a larger one running more or less along the course of the 

 IS T uy Eiver, and a very large spread stretching from ilobertson to 

 Ashton. This outcrop is roughly oval in shape, and measures 

 about 15 miles in length by 6 miles in width. 



The Enon Conglomerate is well seen at Worcester Station, 

 resting unconformably upon Ecca Sandstone. The pebbles here 

 average about 3 inches in diameter, and are embedded in a reddish 

 sandy matrix, which appears to be much weathered. The pebbles 

 are almost wholly composed of hard, dark grits. Much fresher 

 material can be obtained from an excavation recently made close 

 to the new reservoir-dam, north-west of the town, and many 

 blocks have been used in the construction of the dam. The con- 

 glomerate is here extraordinarily hard, and the pebbles are on the 

 average somewhat smaller, so that it can be dressed into hand- 

 specimens. The cement is partly ferruginous and partly calcareous. 

 The conglomerate is also exposed in many places in the sluits before 

 mentioned, but is here much weathered. The pebbles are every- 

 where almost exclusively hard, dark-green, grey, and red grits 

 and rocks of a somewhat jaspery appearance. It is noticeable 

 that the pebbles are very frequently bent, fractured, faulted, and 

 indented, indicating pressure, as in the Poly genetic Conglomerate 

 of Cumberland, to which this rock shows a striking resemblance. 

 It is highly probable that most, if not all, of the rounded gravelly 



