GARLETON HILLS. 87 



been acted upon by disturbing agents, their position ren- 

 ders sufficiently evident.* 



Having now noticed, with considerable minuteness, the 

 various relations of the ignigenous rocks of Mid-Lothian, 

 to the associated stratified formations, we shall in the same 

 way describe similar phenomena which are exhibited in 

 Haddingtonshire.f A considerable portion of this county is 

 composed of igneous masses ; they form all that part which 

 which is included by a line, stretching from Whitberry Point 

 to Linton and Pople : the line of trap-rock here assumes a 

 westerly direction, running along the north back of the Tyne 

 as faras Haddington; and, making a 'detour' by Bangly, pass- 

 es near Ballencrief and Drem toll, till at last it terminates in 

 the sea, forming Goolan Point. Though this is the most ex- 

 tensive body of trap which occurs in East Lothian, still there 

 are^others of a smaller size which exhibit many interesting 

 relations. As in Mid-Lothian the augitic or trap-rocks 

 are associated with those of the felspathic or porphyry series. 

 Rocks of the latter class constitute the Garleton Hills, a 

 range forming the high land which occurs above the town of 

 Haddington, and they enter also into the composition of 

 the eminences of North Berwick-Law and Traprain. The 



* Near the town of West Linton, situated at the farther extremity of 

 the Pentlands, felspathic rocks again appear, rising through the red 

 sandstone. The hill of Mendic is entirely composed of a brown clay- 

 stone porphyry. In its characters, the white sandstone which occurs 

 around West Linton, exhibits some appearances differing from any of 

 the other white sandstones of the Lothians. It contains, as an ingredient, 

 a great abundance of yellowish-white claystone, and indeed, it is only 

 by examining this rock in all its details that its true nature can be ascer- 

 tained; for, when the lines of stratification are imperfect, and no alterna- 

 tions with a more characteristic sandstone visible, it might easily be mis- 

 taken for one of those claystones, which in some parts of this district rise 

 through and occur between the sedimentary deposits. 



t Vide Dr Ogilvy on the Trap- Veins of East Lothians, Wemerian 

 Memoirs, vol. i. Also Professor Jameson on the Geognosy of the Lo- 

 thians, Wemerian Memoirs, vol. ii. 



