The Ancient Volcanic Rocks of South Mountain, Pennsylvania

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Description

From introduction: In December, 1892, as the result of field work on the part of Dr. G. H. Williams in the northern and of the writer in the southern portion of South Mountain, there appeared a preliminary description of two of the rock types, in which their identification as ancient volcanics was announced. In this bulletin it is proposed to substantiate that identification with more detailed proof. It is further proposed to show that these ancient igneous rocks were, at the time of their consolidation, identical in character with their recent volcanic analogues, and that their present differences are due … continued below

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124 p. : ill., maps ; 27 cm.

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Bascom, Florence 1896.

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This report is part of the collection entitled: Technical Report Archive and Image Library and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 151 times, with 5 in the last month. More information about this report can be viewed below.

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Description

From introduction: In December, 1892, as the result of field work on the part of Dr. G. H. Williams in the northern and of the writer in the southern portion of South Mountain, there appeared a preliminary description of two of the rock types, in which their identification as ancient volcanics was announced. In this bulletin it is proposed to substantiate that identification with more detailed proof. It is further proposed to show that these ancient igneous rocks were, at the time of their consolidation, identical in character with their recent volcanic analogues, and that their present differences are due to subsequent changes, chief among which has been devitrification. It is also proposed to recognize these facts in the nomenclature.

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124 p. : ill., maps ; 27 cm.

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  • OCLC: 881832797
  • SuDoc Number: I 19.3:136
  • Report No.: USGS Bulletin 136
  • Archival Resource Key: ark:/67531/metadc957804

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Technical Report Archive and Image Library

The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports. The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format.

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  • 1896

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  • Sept. 17, 2017, 6:24 p.m.

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  • Sept. 22, 2017, 8:49 a.m.

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Bascom, Florence. The Ancient Volcanic Rocks of South Mountain, Pennsylvania, report, 1896; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc957804/: accessed May 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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