STOTANCLEUGH. 99 



reous par, and also, though very rarely, minute imbedded 

 masses of amianthus. The strata of red sandstone, which are 

 exposed on the shore between Dunbar and this point, dip in 

 general at about 20° to the E. S.E. ; but as they approach 

 this dyke of trap they gradually pass into the white sand- 

 stone series, and progressively assume higher angles, till at 

 last there is a complete reversion of position, and they dip to 

 N. W. at 50° reposing on the greenstone. (PL XI. Sec. 2.) 

 In the interior of the county of East Lothian, there are se- 

 veral other points where ignigenous rocks have intruded 

 among the sandstone strata ; few of these, however, exhibit 

 any appearances which require a detailed description. By 

 following a mountain rivulet, which rises in the Hill of 

 Wightman, and joins Stonecleugh Water, near Stotancleugh , 

 five dykes of ferruginous red greenstone cross vertically the 

 conglomerate, which is inclined to the N. E. at 10° ; these 

 veins are all parallel the one with the other, and stand up in 

 the form of walls, the strata in which they occur having 

 been partially removed by the action of the atmosphere. In 

 regard to the appearances which the conglomerate puts on, 

 when in contact with the trap, they are not of a marked na- 

 ture, induration being only recognizable in the fact of small 

 portions of the conglomerate still adhering to the sides of the 

 trap veins. (PI. XII. Fig. 1.) If we consider, however, 

 the coarseness of this conglomerate, and that it is held to- 

 gether so imperfectly, as to be liker shingle on a sea-beach 

 than a rock of such antiquity, the want of induration may 

 not be wondered at. In no place can there be a more con- 

 clusive evidence that the origin of greenstone and these stra- 

 tified rocks is perfectly distinct ; for, in this instance, a rock, 

 bearing on its front all the characters which might be ex- 

 pected to occur, in a mass at one period in a state adequate 

 for the crystalline arrangement of its components, rises 

 g 2 



