GEOL 270: Sedimentology and Stratigraphy Lecture 2 Quiz
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GEOL 270: Sedimentology and Stratigraphy Lecture 2 Quiz

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Questions and Answers

What type of clast shape is formed when the edges of equally spaced fracture planes in all directions are rounded off?

  • Prolate
  • Oblate
  • Equant (correct)
  • Discoid

    • Which type of clast shape is less common and forms mainly from metamorphic rocks with a strong linear fabric?

  • Rod-shaped or prolate (correct)
  • Equant
  • Oblate
  • Discoid

    • What is the relationship between imbrication and flow direction as clasts settle?

  • Imbricated clasts dip perpendicular to flow direction
  • Imbricated clasts dip upstream (correct)
  • Imbricated clasts are randomly oriented
  • Imbricated clasts dip downstream

    • What type of rocks are most likely to form elongated clasts due to breaking along the foliation plane?

    <p>Metamorphic rocks</p> Signup and view all the answers

    What is the typical dip angle of sand grains showing well-developed imbrication?

    <p>Less than 20°</p> Signup and view all the answers

    What term is used to describe the overlapping arrangement of particles, like that of shingles on a roof?

    <p>Imbrication</p> Signup and view all the answers

    Which of the following statements about clastic sedimentary rocks is correct?

    <p>Clastic sedimentary rocks are derived from the erosion and weathering of pre-existing rocks.</p> Signup and view all the answers

    What is the term used to describe the size, shape, and arrangement of grains or particles in a sedimentary rock?

    <p>Fabric</p> Signup and view all the answers

    Which of the following best describes the term 'clast'?

    <p>A particle or fragment derived from the erosion and weathering of pre-existing rocks.</p> Signup and view all the answers

    What is the term used to describe the fine-grained material surrounding larger particles in a sedimentary rock?

    <p>Matrix</p> Signup and view all the answers

    Which of the following terms refers to the physical characteristics and mineral composition of a sedimentary rock?

    <p>Lithology</p> Signup and view all the answers

    Which of the following statements about grain size in sedimentary rocks is correct?

    <p>Grain size can range from clay particles measured in microns to boulders measured in meters.</p> Signup and view all the answers

    Which of the following is NOT a factor that influences the texture of siliciclastic rocks?

    <p>Grain sorting</p> Signup and view all the answers

    What is the term used to describe the spatial arrangement and orientation of grains in a sedimentary rock?

    <p>Fabric</p> Signup and view all the answers

    Which of the following grain size classes is defined by a range of $4-63 \ ext{mu} m$?

    <p>Silt</p> Signup and view all the answers

    Which term is used to describe a conglomerate where the clasts are angular in shape?

    <p>Breccia</p> Signup and view all the answers

    Which term is used to describe a conglomerate where the clasts are composed of only one type of rock?

    <p>Monomict</p> Signup and view all the answers

    Which textural characteristic of a conglomerate indicates that it was deposited by bedload transport, like in a river?

    <p>Clast-supported</p> Signup and view all the answers

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