Clastic Sedimentology And Petrography-quiz 1

15 Questions | Total Attempts: 158

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Clastic Sedimentology And Petrography-quiz 1

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Questions and Answers
  • 1. 
    Gravels (including pebbles) are pieces of older rock material greater than                . 
    • A. 

      2 mm

    • B. 

      4 mm

    • C. 

      64 mm

    • D. 

      256 mm

  • 2. 
    The angularity of the edges and corners of grains in a sedimentary rock is referred to as:
    • A. 

      Roughness

    • B. 

      Rounding

    • C. 

      Abruptness

    • D. 

      Smoothness

  • 3. 
    A clastic rock is:
    • A. 

      Transformed by pressure into limestone

    • B. 

      Transformed by heat into limestone

    • C. 

      A rock formed from the cementation of transported grains

    • D. 

      A rock formed from the cementation of transported grains

  • 4. 
    The tendency for variations in current velocity to segregate sediments on the basis of particle size is called _____. 
    • A. 

      Sorting

    • B. 

      Metamorphism

    • C. 

      Lilthification

    • D. 

      Compaction

  • 5. 
    Turbulent flows in an upper flow regime will result in the formation of :
    • A. 

      Dunes

    • B. 

      Ripples

    • C. 

      Antidunes

    • D. 

      Plane beds

  • 6. 
    Which of the following lists is written in order of decreasing particle size?
    • A. 

      Sandstone, siltstone, conglomerate

    • B. 

      Conglomerate, sandstone, siltstone

    • C. 

      Sandstone, conglomerate, siltstone

    • D. 

      Siltstone, sandstone, conglomerate

  • 7. 
    Siltstones are coarser grained than                              .
    • A. 

      Claystones

    • B. 

      Very fine grained sandstones

    • C. 

      Very fine grained siltstones

    • D. 

      Mudstones

  • 8. 
    Sandstones and conglomerates make up 20- 25%of the sedimentary rocks in the stratigraphic record and mudrocks are 60%of the total.
    • A. 

      True

    • B. 

      False

  • 9. 
    Clasts over 4mm in diameter are divided into granules,pebbles,cobbles, and boulders.
    • A. 

      True

    • B. 

      False

  • 10. 
    The symbol represent a .................... .
  • 11. 
    The symbol represent what type of sedimentary structure?
  • 12. 
    When discoid clasts are moved in a flow of water they are preferentially oriented and may stackup in a form known as imbrication.
    • A. 

      True

    • B. 

      False

  • 13. 
    If the Fraude Number in an open channel flow is > 1, it means it is a:
    • A. 

      Sub-critical flow

    • B. 

      Super-critical flow

    • C. 

      Stagnant flow

    • D. 

      Critical flow

  • 14. 
    Clastic sedimentary rocks are composed of                     and rock fragments derived from pre-existing material.
  • 15. 
    Only 45% feldspar need to b epresent for the rock to be called a feldspathic arenite,arkosic arenite or arkose.
    • A. 

      True

    • B. 

      False

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