Boulders near Lennoxtown, Scotland. 



27 



It has not been considered necessary to restrict the investigation 

 to material occurring in situ in the drift; the dry stone dykes, "which 

 are mostly composed of surface boulders gathered from the immediate 

 neighbourhood, have afforded the means of finding most of the larger 

 specimens, and, since the essexite has never been quarried, they 

 clearly afford a legitimate source of evidence. Many boulders, too, 

 have been found washed out along the courses of burns and also 

 along the shores of the Firth of Forth. 



As may be seen from the accompanying map, the cone of distribution 

 in the immediate neighbourhood of the intrusion is well marked, and the 

 carrj^ is wholly eastwards ; uphill to the north and north-west of the 

 intrusion there are no boulders, and, although about 100 yards along 

 the road to the west of the intrusion a couple of boulders were 

 found in a wall, they have evidentlj' been carried there for building 

 purposes. Downhill, to the south of the igneous mass, there are 

 numerous boulders, forming a distinct cone, with the west end of 

 the intrusion for its apex, and spreading out eastwards, till at the 

 east end of the intrusion the cone is some 450 yards wide. About 

 400 yards downhill from the west end of the intrusion there are 

 one or two small blocks now built into a wall ; these may, however, 

 have fallen downhill since Glacial times; they are augular, and show 

 no evidence of having been affected by ice. 



The southern edge of the cone ci'osses the Crow Eoad about 

 a (juarter of a mile from Lennoxtown, and runs eastward from the 

 mass of essexite, the erratics being more numerous in the centre 

 of the cone ; still farther east the boulder track begins to ascend the 

 hill till its northern limit, at a point due north of Lennoxtown, is 

 about 800 feet above sea-level, and its breadth is between 600 and 

 700 yards. 



Map 1. 



SCALE. or MILES 



Miip showing (li^tiilnition ol erratics in immediate neighbourhood of essexite 



intrusion. 



