1869.] 



MACKINTOSH LANCASHIEE AND CUMBERLAND DRIFTS. 



409 



a. Upper Boulder-clay. — The existence of an Upper Boulder-clay 

 along the coast is clearly defined. It stretches into the interior to 

 an unknown distance. On the coast it thins out and disappears in 

 a southerly direction. A considerable thickness of it may be seen 

 as far south as Market Street, Blackpool, in a recess on the west side 

 of which this clay is now in course of being excavated (Dec. 1868). 

 It may be seen in the railway-cutting near the Blackpool station, 

 further south in the brick-pits near the IS'ational School; and I have 

 traced it thinning out over a light-coloured tenacious clay (Lower 

 Boulder-clay ?) east of the old Independent chapel (see Postglacial 

 deposits). West of the Independent chapel, the clay now in course 

 of being carted away to the south shore appears to be a deeper, 



Fig. 2. — STcetch~map of the Peninsula of Furness. 



Ulackcernbe ^My^'';:^^ 



Boulder-clav of uncertain age, 

 with sand and gravel- 



Grlacial striae. 



OE THE MAPS. 



a rough idea of the distribution of drifts. Where there is no stippling, the areas 

 the stippling in some places is extended to areas covered with earth and detritus 

 No attempt has been made to map the Postglacial deposits. 



