372 



MK. A. STKAHAN ON THE GLACIATION OF 



was effected from the north-west or from the south-east. In some 

 cases it has been noticed that pebbles half imbedded in the rock are 

 bruised on those sides which face the south-east, apparently through 



Fig. 2. — Diagram showing directions of Strice in South Lancashire 

 and Cheshire. 





having been opposed to the ice, as mentioned by Mr. Morton *. Dr. 

 Ricketts, as previouslj'- stated, inferred from the nature of the groovings 

 that this was the direction at Thatto Heath. On the other hand, 

 Mr. Mellard Eeade refers to a rubble of local rocks which had 

 apparently been pushed by a force acting from the N.N.W. In the 

 case of the cross striae at Bootle, Mr. Eeade inferred from the outline 

 of the rock that the movement had been from the west. 



I was not able in any of the striae I observed to find 

 evidence bearing on this point, but I noticed terminal curvature in 

 several places, that is to say the bending back of strata at their 

 outcrop as if by pressure f. In all cases in the Mersey valley the 

 bending back was from the north-west, and was independent of 

 the local configuration of the ground. A similar observation was 



* ' British Association Eeport ' for 1870. 



t '■' Geology of Prescot" (G-eol. Survey Memoir), 3rd edition, figs. 7, 8, & 9, 

 and "G-eology of Chester" (G-eol. Survey Memoir), p. 30, fig. 8. 



