Art. VI] ScHEFFEi,, Origin of Spring J^allcy Gorge. 155 



Fig. 1. Contour mai) (jf the Old Valley. X-X marks the limits of Spring 

 Valley. S and -&" are captured streams now tributary to Spring Valley stream. 

 J — The junction of two streams forming Spring Valley stream. C — Cut of this 

 stream across the old pre-glacial channel of the tributary ,Sf. W — 145 ft. well. 

 P — At this point the Spring Valley stream is flowing on rock, between a rock 

 wall on the east, and a wall of glacial debris across the flood plain on the west. 



