NORTH-WEST OF ENGLAND AND NORTH WALES. 



97 



The sections of the two trenches are from diagrams and descrip- 

 tions kindly given me by Mr. Martin, the resident engineer. 



Eig. 13. — Section in Yarrow Trench, Yarrow Reservoir, 1872-75. 

 (Horizontal and vertical scales 220 feet to 1 inch.) 



s.w. 



N.E 



A, A. Bottom, as excavated. 



B. Hard grit rock. 



C, C. Black shale. 



D. Soft broken shale and clay. 



E. Soft shale. 



I\ Loam, sand, and veins of gravel. 



G-. Gravel. 



H. Soil. 



Pig. 14. — Section of Turner's Side Trench, Rivington. 

 (Scale as in fig. 12). 



1. Brown clay with boulders. 



2. Sand and gravel current-bedded, together and mixed witb clay. 



3. Rubble debris of coal-shale in large angular blocks. 



4. Coal shales. 



At a the clay was not. bottomed at 20 feet deep. 

 b is supposed to be another section of the gully. 



Fig. 15. — Section in Cutting on the west side of Yarrow Reservoi/ 



1. Yellowish clay, 3 feet. 



2. Brown clay with angular fragments of coal shale. 



3. Blue clay (Till) very hard, but falls when wet— full of pebbles, and 



containing many Millstone-grit boulders (up to 8 tons) mostly 

 waterworn, but none glaciated. 



