Contributions in geographical exploration . FF OF THE XO ON THIiSURROUNDING In view of these anomalous conditions, we felt that to adoptthe hypothesis that the tuff of the Valley was a mud flow wouldraise more problems than it would solve. Such a sup])ositionappeared, therefore, of little value in interpreting the were left for a long while, therefore, without any hypothesiswhatever to account for what we saw. Nevertheless, detailed examination of the surroundingmountains confirmed the suggestion of the high water mark—that the tuff was confined


Contributions in geographical exploration . FF OF THE XO ON THIiSURROUNDING In view of these anomalous conditions, we felt that to adoptthe hypothesis that the tuff of the Valley was a mud flow wouldraise more problems than it would solve. Such a sup])ositionappeared, therefore, of little value in interpreting the were left for a long while, therefore, without any hypothesiswhatever to account for what we saw. Nevertheless, detailed examination of the surroundingmountains confirmed the suggestion of the high water mark—that the tuff was confined to the floor of the Valley—for it hadabsolutely no counterpart on the slopes above. They wereeverywhere clothed with the same strata of ash as covered thetuff itself. This stratified ash always rested directly on theoriginal surface of the ground—bed rock or old soil as the casemight be, without the slightest indication of anything cor-responding to the massive deposit in the Valley. 126 The Ohio Journal of Science [Vol. XIX, No. 2,. ^ o (U o W :;3 <u ^ ;-< (/J , Z O +3d J C tn o f-K •^ 3 y, -1^ „^ M ^^ ^ O S ^ o ^?5 s -l-i M •d c Dec, 1918] The Great Hot Mud Flow 127


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