Contributions in geographical exploration . he great mud flow that fills the valleys through-out this zone that we began to find evidence confirming thesuspicions aroused by the absence of plant remains aroundits head. In its upper portion the mud flow is so thick thatwe could nowhere find a stream-trench or fault line suffi-ciently deep to expose the relations of the mud flow to theunderlying original soil. But at its lower end, where it is Jan., IJlUj Effects oj the Eruption on Vegetation 205 thinner, there is abundant opjjortunity to observe its eflfecton vegetation. Here the mud flowed dow
Contributions in geographical exploration . he great mud flow that fills the valleys through-out this zone that we began to find evidence confirming thesuspicions aroused by the absence of plant remains aroundits head. In its upper portion the mud flow is so thick thatwe could nowhere find a stream-trench or fault line suffi-ciently deep to expose the relations of the mud flow to theunderlying original soil. But at its lower end, where it is Jan., IJlUj Effects oj the Eruption on Vegetation 205 thinner, there is abundant opjjortunity to observe its eflfecton vegetation. Here the mud flowed down through the forest engulfingthe trees that stood in its path. (See below). If onew^alks along the edge of the flow where its effect on thetrees can best be observed he can see what hai)pened in theclearest possible fashion. The trees and bushes everywhereshow evidence of disturbance by the moving stream of mud,but there is no indication of such violent action as would havebeen left in the wake of a torrent of water, for none of the trees.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishercolum, bookyear1920
