634 



Mr. Aubrey Strahan 



[March 1' 



surface ascends at a gradient of about 1 in 16 until it meets the 

 Secondary base near Ramsgate ; westwards it ascends at a shghtly 

 steeper angle (about 1 in 7 J), and meets that base near Elham and 

 Canterbury. These structures are illustrated by the section drawn 

 across the^rouorh at right angles to its axis. It will be noticed that 



,Heme 



.Chilly 



RAMSGATE § 



.Braboume 



V*rt.ic«l Scale 3iima xt» Horizontal 



Fig. 4. 



no bore-hole has reached the base of the coal measures in the southern 

 and central part of the trough. The coal measures there have been 

 jjroved to exceed 2700 feet in thickness, and the limits of the ex- 

 tension under the sea are unknown. 



The geological relations of the Kent coal-field to that of the 

 Pas de Calais on the one side and to those of Bristol and South 



