WILKIE HAUGH. 1)5 



strata of sandstone, shale, and red calcareous ironstone, si- 

 milar to those exposed at Whitberry Point, again appear, 

 dipping S. S.E. at a small angle. At Wilkie Haugh a 

 great mass of greenstone rises through the strata and tra- 

 verses them in veins, which, in some instances, run a dis- 

 tinct course for several hundred yards. On examining these 

 veins numerous masses of the various stratified rocks which 

 they traverse are found completely enveloped, all of which 

 are intensely indurated. Forming a mass imbedded in this 

 greenstone, a body of trap-tufa, several yards in extent, is 

 to be observed ; it is composed of angular fragments of 

 sandstone, slate, trap, and felspar porphyry, which are held 

 together by a basis of red trap. The greenstone of this 

 point is of the usual description, but as it approaches the 

 sandstone it becomes highly charged with iron, which causes 

 it to assume a reddish-brown colour. Cavities lined with 

 crystals of amethyst and quartz occur in the trap ; it is 

 also traversed by numerous minute veins of calcareous spar, 

 and in one place by two of sulphate of barytes, which vary 

 from one to four inches in breadth. Proceeding along the 

 shore in the direction of Dunbar, slightly inclined strata of 

 sandstone, ironstone, and shale are exposed for a considerable 

 way, lying under a deposit of a red trap-tufa of great thick- 

 ness, which forms the sea-cliffs till within a short distance 

 of the Castle. The tufa which occurs in such abundance 

 in this part of the coast is composed of fragments of various 

 trap-rocks, of sandstone, limestone, ironstone, and shale, 

 all of which vary in size from the smallest magnitude to 

 one or two feet, and are imbedded in a base of red wacka- 

 ceous clay, which, in some instances, without containing the 

 usual fragments, occurs for a considerable extent, and, 

 throughout, exhibits a more or less stratified arrangement. 

 The tufa is in some places traversed by veins of greenstone, 

 but these afford no remarkable appearances. 



