File:Annual report of the United States Geological Survey to the Secretary of the Interior (1899) (14761137284).jpg

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Identifier: annualreportofun2171geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ILLINOIS PLATE XUV. 333 PLATE XLIV. Characteristic Fossils of the Austin Chalk. Fig. 1. Radiolites austinensis, Roem.Figs. 2, 2a, 2b, 2c. Terebratulina guadalupse Roem.Figs 3,3a. Ammonites dentatocarinatus Roem.Figs. 4, 4a. Mortoniceras texanum Roem.Fig. 2 is enlarged 5 times; other figures are natural size.334 U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART VII PL. XLIV
Text Appearing After Image:
CHARACTERISTIC FOSSILS OF THE AUSTIN CHALK THE MERIOEN GRAVURE CO. UririrtRYOf THKUNIVERSITY of ILLINOIS HILL.) FOSSILS OF AUSTIN CHALK. 335 projected in parallel benches. Even in the thick bed there is muchvariation in their resistance to weather, which is governed by thevarying percentage of siliceous material of which they are composed. From the base upward for about 200 feet the limestone is in itspurest state and occurs in massive beds from 2 or 3 to 10 feet thick,with borders of slightly argillaceous limestone. Mortoniceras texanum(see PI. XL1V, tigs. 1, 4a) and a large species of Inoceramus arefound. Typical exposures of this portion occur along the immediatebank of Brushy Creek from 2i to <6\ miles below Round Rock. The succeeding strata become slightly arenaceous, containing about10 per cent of silica, and occur in slightly thinner beds, which aremuch more fossiliferous than the more chalky layers below. Theseslightly arenaceous beds, the exact thickness of which is not kn

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https://www.flickr.com/photos/internetarchivebookimages/14761137284/

Author Geological Survey (U.S.)
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1899
Flickr tags
InfoField
  • bookid:annualreportofun2171geol
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Geological_Survey__U_S__
  • booksubject:Geological_Survey__U_S__
  • booksubject:Geology
  • booksubject:Water_supply
  • booksubject:Forest_reserves
  • booksubject:Mines_and_mineral_resources
  • bookpublisher:Washington___G_P_O_
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:438
  • bookcollection:university_of_illinois_urbana-champaign
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
28 July 2014



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