Contributions in geographical exploration . ,from the surrounding mountains to the Valley floor. Thebroad smooth floor of the Valley, although broken by thethousands of fissures and craters from which issue its millionsof volcanoes, shows no orifices that give any particular evidenceof having been the source of the mud. The only thing to guideus in our search was the slope of the high mud marks, for sincethe mud flowed down the valley under gravity it must haveoriginated, in part at least, near the highest points that it covered. 140 The Ohio Journal of Science [Vol. XIX, No. 2, PROBABLY ERUPT
Contributions in geographical exploration . ,from the surrounding mountains to the Valley floor. Thebroad smooth floor of the Valley, although broken by thethousands of fissures and craters from which issue its millionsof volcanoes, shows no orifices that give any particular evidenceof having been the source of the mud. The only thing to guideus in our search was the slope of the high mud marks, for sincethe mud flowed down the valley under gravity it must haveoriginated, in part at least, near the highest points that it covered. 140 The Ohio Journal of Science [Vol. XIX, No. 2, PROBABLY ERUPTED FROM SEVERAL FISSURES. From this fact it becomes at once evident that it couldnot have come from a single orifice, for there are two distinctsummits from each of which it flowed in both directions. One ofthese is Katmai Pass, the other is in the vicinity of NovaruptaVolcano. The altitude of both is in the neighborhood of 3,000feet. From Katmai Pass the mud flow not only reaches intothe Vallev of Ten Thousand Smokes, but extends down the. Photograph by D. B. Church PART OF THE MUD FLOW ACROSS THE PASS FROM THE VALLEY. Looking toward Observation Mountain from the upper flat of Mageik Creek. The layers of Katmai ash covered by a secondary flow are plainly shown in the bluff, two-thirds of the way up. valley of Mageik Creek to the foot of Observation Mountain,against which it accumulated to a thickness of 30 or 40 feet.(See picture above). Novarupta, although situated in the floor of the Valley, islocated near a col which separates the two arms of the Valleythat encircle the Broken Mountains. On the west side ofthis col the surface of the mud flow descends till it joins thebranch coming down from the Pass at an altitude of about2300 feet, then continues its descent across the front of Cerberusand Mageik down the main valley to the terminus of the flow, Dec, 191SJ The Great Hot Mud Floiv 141 a hundred feet above sea level. From the east side of the dividethe mud flow slopes gentl
Size: 1998px × 1251px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishercolum, bookyear1920
