TRIASSIC STRATA OP LANCASHIRE. 



117 



Railway Bridge^ the pebble-beds make their appearance. 

 They consist of a soft red sandstone, containing rounded 

 pebbles of white and brown quartz, and dip at a consider- 

 able angle to the S.S.E. Only a small portion of the rock 

 is exposed, so that no other dip could be obtained, which 

 on the whole, if it could ' be seen more extensively, most 

 probably is more to the west. 



Section from Preston to Roach Bridge. 



Distance, 4 miles. 



On following the river up to Walton, little evidence of 

 the Trias is to be seen, so far as I observed ; biit on track- 

 ing the Darwen a couple of miles to the turn of the river, 

 above the Bannister Hall Print Works, a soft red sandstone, 

 much bedded, makes its appearance, which dips W.S.W. 

 at an angle of 9°. After following this rock up the river, 

 rounded pebbles of brown and white quartz are seen in it, 

 as well as small pockets of red marl. At the weir the 

 same sandstone appears in great force, and the river flows 

 over it and forms a cascade. A bed of micaceous shale, of 

 a red colour, i foot 6 inches in thickness, divides the rock. 

 The dip is to the west, at 18°. Nothing is seeu in the 

 river for about half a mile, and there is space for a great 

 deposit of a lower soft red sandstone (Trias) or Permian red 

 marls ; but no evidence is to be had of the strata until the 

 most westerly houses of Boach Bridge are reached. At 

 Boach Bridge, in Samlesbury, an interesting section is seen 

 on the banks of the river. The strata consists of a soft 

 yellow sandstone, ripple-marked and false-bedded, some 

 of the lower portions of which have formerly been used for 

 building purposes, but with little success, as the perishing 



