MAPPING OF GEOLOGIC FORMATIONS BY THE APPLICATION OF AERIAL PHOTOGRAPHY

PREVIOUSLY GENERALIZED PARENT-MATERIAL AREAS HAVE BEEN MAPPED SUCCESSFULLY BY THE APPLICATION OF AERIAL PHOTOGRAPHS. THIS PROJECT IS UNIQUE IN THAT GEOLOGIC FORMATIONS HAVE BEEN MAPPED BY THIS METHOD. THIS PAPER DESCRIBES THE GEOLOGIC MAPPING OF AN AREA IN THE RIDGE AND VALLEY PROVINCE OF CENTRAL AUGUSTA COUNTY, VIRGINIA. THE ROCKS ARE OF SEDIMENTARY ORIGIN WITH A FEW IGNEOUS INTRUSIVES, SHALE, LIMESTONE, AND SANDSTONE BEING THE PREDOMINANT ROCK TYPES. THE FORMATIONS ARE OF LATE CAMBRIAN AND ORDOVICIAN AGE. SOME OF THE LIMESTONE FORMATIONS HAVE A HIGH CALCIUM CONTENT, WITH LITTLE IMPURITIES. OTHERS CONTAIN MUCH CHERT AND ARGILACEOUS MATERIAL. FOR THIS REASON SEPARATION OF THESE FORMATIONS WAS DESIRABLE. KEY FORMATIONS WITH KNOWN PHYSICAL CHARACTERISTICS AND CHEMICAL COMPOSITION PRODUCED DISTINCTIVE AIRPHOTO PATTERNS, THE REPETITIVE NATURE OF WHICH MADE POSSIBLE THE DELINEATION OF EACH FORMATION. AS AN EXAMPLE, ONE FORMATION CONTAINED MUCH CHERT. UPON WEATHERING KNOLLS AND ROUNDED HILLS RESULTED. THESE FEATURES STOOD OUT FROM SURROUNDING TOPOGRAPHY MAKING THE FORMATION EASY TO TRACE. ANOTHER FORMATION HIGH IN CALCIUM WAS FOUND TO OCCUPY LOW TOPOGRAPHY. THIS TOO WAS DELINEATED. BY KNOWING THE RELATIVE POSITION OF THESE KEY FORMATIONS IN STRATIGRAPHIC SEQUENCE OTHER FORMATIONS THUS FELL INTO PLACE. REPRESENTATIVE SAMPLES OF SOILS AND AGGREGATES WERE OBTAINED AND ROUTINE TESTS WERE PERFORMED. RESULTS OF THESE TESTS WERE TABULATED SO THAT THE EXTENT OF FORMATIONS CONTAINING BOTH SUITABLE AND UNSUITABLE MATERIALS WOULD BE KNOWN. THIS PAPER DESCRIBES THE PROCEDURE, METHODS, AND RESULTS OF THE APPLICATION OF AERIAL PHOTOGRAPHY TO GEOLOGIC MAPPING. THE SUCCESSFUL APPLICATION OF THIS TECHNIQUE HAS BEEN PROVEN. ITS EXTENSION TO OTHER AREAS IS INDICATED. /AUTHOR/

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  • Supplemental Notes:
    • No 46, pp 67-86, 26 FIG, 4 TAB, 27 REF, 1 APP Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • Browning Jr, William F
  • Publication Date: 1951

Language

  • English

Media Info

  • Media Type: Print
  • Pagination: pp 67-86
  • Monograph Title: Engineering soil survey mapping
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00229539
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:38AM