File:Popular science monthly (1872) (14596095890).jpg

Identifier: popularsciencemo89newyuoft (find matches)
Title: Popular science monthly
Year: 1872 (1870s)
Authors:
Subjects: Science
Publisher: New York : D. Appleton
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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The Upper BoiJderIs of MassachusettsGranite. It Is Rest-ing on a Rock ofGneiss, and Bothare Perched on aGranite Ledge ofDifferent TextureFrom That of theUpperOranite Rock At Left Below, ARock Transportedand Deposited byHuge Glaciers fromthe Sierra Nevada.This Rock will Out-last Its Base ManyThousand Years Below, An ErraticRock FragmentResting on a BigBase, Brought toIts Present Posi-tion by an AgencyPowerful Enoughto Transport ItOver Irregularitiesin Land Surface Popular Srirnct Mnvlhl 41,
Text Appearing After Image:
Above, A PerchedGranite BoulderLeft on a SandstoneBase by a GlacierWhich Melted on aSlope of the FamousYosemite Valley,California. TheSandstone PedestalIs Greatly Weath-ered and in aHundred ThousandYears, Perhaps, ItWill Wear Awayand Precipitate theHeavy Boulder Intothe Canyon Below At Right, The LargeBoulder WhichServes as the BaseIs Rapidly WastingAway While theSmaller. Boulder onTop of It—Weigh-ing a Ton or so—Shows No Signs ofDeterioration, Al-though It Has Pro-bably Rested inThis Position Forthe Better Part of aThousand Cen-turies or More 416 Popular Science Monthly The photograph with the man stand-ing i)esi(Je a rork shows a perchedgranite boulder left on a sandstone baseby a glacier which melted on a slope ofthe famous Yosemite Valley, California,a \ast gash in theSierra Nevada,now believed tohave been largelycut out by glacialaction. Since theboulder was so de-posited it haschanged but little.The sandstonepedestal, however,is greatly weather-ed and in thenatural course of

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