Q. J. G. S. vol. ilvii.] 



EXPLANATION OF THE MAP. 



This Map, traced from the Ordnance Survey on the six-inch scale, 

 shows the areas in which the porphyroids of Sharpley and of Peldar 

 Tor are exposed, and the regions beneath which they probably occur. 

 The latter are obtained approximately by connecting together the 

 outermost outcrops of each tj-pe of rook with straight lines, so as to 

 define an area within which no other rock is visible. The Map also 

 marks the outcrops of other rooks surrounding the above-named 

 areas, and indicates their nature in each case. No attempt has 

 been made to give an accurate representation of the outlines of the 

 visible rock-masses. The place has been determined by the indica- 

 tions on tlie Map, and the outline sketched in from memory ; more- 

 over, in some cases a number of separated outcrops, which are in 

 proximity one to another, are represented as if they formed, as no 

 doubt they do, a continuous mass. 



[2'o fuu p. 80. 





MAP OF THE AREAS OF 





SHARPLEY AND PELDAR TOR 





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