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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Nov. 15, 



Scotland may tend, if carefully examined, to explain the particular 

 mode in which such phsenomena have been produced, it is probable 



Figs. 1, 2, & 3. — Sections and Plan of Dumbarton Rock, showing 

 the position and direction of the Glacial Strice. 



Fig. 1. — Transverse Section of the Rock of Dumbarton, made in the direction of 

 the Fissure which runs through its centre from North to South. 



a. Western side of fissure on which the Striae are chiefly seen. 



b. Line supposed to indicate the former depth of the fissure, now filled up 



to form the base of the buildings and barrack-yard. 



Fig. 2. — Longitudinal Section of the Rock, showing the inclination of the lines of 

 fracture, and the corresponding inclination of the sides of the Fissure. 



a. Western or overhanging side, on the surface of which very distinct glacial 

 traces are seen. 



b. Eastern side, on the upper part of which Striae are seen. 



c. Lower part supposed to have been artificially removed. 



d. Steps. 



