120 GEOLOGY OF THE LOTHIANS. 



Pathhead, a westerly direction, and runs thus as far as 

 Duchrie Dod, a hill near Presmennan. From the Dod hill 

 of Duchrie, the greywacke country is then bounded by a 

 line running N. E. and S. W. near Stoney Path, Castle 

 Moffat, Ryestubble, and Danskin. After leaving Danskin, 

 the boundary line assumes an east and westerly direction, 

 passing near Quarryford Mill, Bog Hall, Cairny Haugh, and 

 Newton Hall, when it turns to the S. W. running through 

 Stob Shiels, Blegbie, Keith Hill, Pockbie, and Soutra 

 Mains. In Mid-Lothian there is hardly any irregularity 

 in the direction of the line which separates the transition 

 from the secondary rocks ; indeed, it may be said to stretch 

 with little variation directly W. S., the hills of Cakemuir, 

 Fala Hill, Ruther Law, Wullmuir, Turtichen, Huntly, and 

 Mausely, forming a well defined boundary. In regard to 

 the distribution of the secondary formations, they form, 

 with the exception of numerous detached masses of trap 

 rock, and the felspathic range of the Pentlands, the whole 

 of the three Lothians, unoccupied by the transition series. 

 In East Lothian a formation of red sandstone and variously 

 coloured shales, forms a great extent of undulating country ; 

 this deposit, however, exhibits no exact line of boundary, 

 as it passes always by an insensible gradation into the re- 

 gular coal-formation. We may, however, affirm that by 

 drawing a line from Cockburnspath through Thornton and 

 Oxwellmains to Broxburn, we indicate, in a sufficiently 

 exact manner, the district in which the transition of the one 

 series of sandstone into the other takes place. Dunbar, the 

 course of the Tyne from its confluence with the sea to 

 Preston Kirk, Sunnyside, Pople, and Whitelaw Hill, may 

 be stated as chief points, between which and the transition 

 strata no other rocks but those of the red sandstone series 



