File:Contributions in geographical exploration (1920) (14781304875).jpg

Identifier: contributionsing00ohiouoft (find matches)
Title: Contributions in geographical exploration
Year: 1920 (1920s)
Authors: Ohio State University
Subjects:
Publisher: Columbus
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: MSN

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Flwtograph hy J. If. Shiph-yA NEARER VIEW OF A LINE OF FUMAROLES.There is no surface indication of fracture. They probably spring from a tleep- seated fissure. These conduits ran clear down through the tuff to the bed rockbeneath. (See page 110). At another place, we found a depositon the surface of the bed rock which looked like that from anold fumarole, having apparently been formed by continuedaction of the fumarole after the erosion of the overlying tuff.We were not, however, satisfied with such evidence of burnedout fumaroles, for there is always the possibility of misinterpret- no The Ohio Journal of Science (Vol. XIX, No. 2,
Text Appearing After Image:
Photograph by R. F. Griggs A FILLED CRATER IN THE MUD FLOW. The crater was formed in the mud flow by explosive action originating below thebase of the section, which here rests on undisturbed sandstone strata exposedby the stream in the foreground. This crater stood open during the explosionof Katmai, whose three-layered ash, marked K, may be plainly seen on thetop of the original mud surface. Later there came a secondary flow of mudwhich filled up the crater and piled up about ten feet above the surface of theprimary flow. The fill did not, however, choke off the fumarole which forsome time maintained an open vent to the surface, shown in the photographby a faint vertical streak rising from the bottom of the crater. Dec, 1918) Are the Ten Thousand Smokes Real Volcanoes.^ HI ing the character of such deposits. We were not wiHin^ toadopt so important a hypothesis unless we could find conclusiveproof of its correctness. We were the more cautious in this matterbecause the underlying rock

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