Plate 



Boulder of "middle Potsdam" conglomerate in field south of "The 

 • Bunch" cottage (locality 75) on the east bank of the Grass river south of 



Canton (Looking northeast) 

 The pebbles consist chiefly of red jasper which has been bleached to milk 

 white by pre-" Potsdam " weathering, except at the hearts of the larger 

 pieces. The sand-matrix also is decolorized. Contrast the basal beds. 



See pages 13 and 44. 



