4 ~ ee BY: HILLs It seens highly probable. This would make it interesting to look at the Lake Mead Bbituation, wouldn't 4t? TH‘I2s Or some of the sasples taken in the Grand Canyon silt GRIGSS Aren't there two factors in this probleny one, that of and transport of material and second, the time lag be tions. errosioca rainfall and appearance in a stream down below. In Massachusettsi isn't | the second factor also inportant? THEISs I don't quite understand the second point. CHIGGS s Ags I onderstand it, in glaciera we expect water to fall, [it is stored and later appears down water with a time lag of WOICEs Yes, that would be a possibility. nonths,. Much of the water evaporated. CRIGGE:s It is not necessary, for your criterion, that the na physically eroded. Like in a place where you have rapid with or without erosion you might get mere concentration THEIS:s T think that is so and I think that the nature of this would be weary irportant. be absorbed. If it is fonic im form it will If it is sone of this fine ultra-small culate matter, it might go into the cround water and be carried, //f