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Geology Quiz Chapter 6-2

22 Questions
Geology Quiz Chapter 6-2

Chapter6

Questions and Answers
  • 1. 
    Which characteristic is absolutely necessary for a sedimentary rock to have potential as a possible reservoir rock for oil or gas?
    • A. 

      High porosity

    • B. 

      Classic texture

    • C. 

      Chemical origin

    • D. 

      Good stratification

  • 2. 
      Coal beds originate in _______.
    • A. 

      Shallow lakes in a dry, desert region.

    • B. 

      Channels of fast-moving streams

    • C. 

      Deep, marine basins below wave action

    • D. 

      Freshwater coastal swamps and bogs

  • 3. 
    Which of the following sedimentary features can each be used to determine paleocurrent directions?
    • A. 

      Mud cracks and ripple marks

    • B. 

      Ripple marks and cross stratification

    • C. 

      Fossils and mud cracks

    • D. 

      Grain size sorting and ripple marks

  • 4. 
    Oolitic limestone is most likely to form in what type of depositional environment?
    • A. 

      Quiet, muddy, lagoons and bays

    • B. 

      Shallow, clear, marine waters with vigorous current activity

    • C. 

      Deep, marine waters below most wave action

    • D. 

      Acidic organic rich waters in freshwater swamps and bogs

  • 5. 
    ____is the most common type of chemical sedimentary rock
    • A. 

      Limestone

    • B. 

      Chert

    • C. 

      Phosphate rock

    • D. 

      Quartz sandstone

  • 6. 
    Which of the following sedimentary rocks would you expect to have originally been deposited by fast-moving streams?
    • A. 

      Mudsone

    • B. 

      Oolitic limesone

    • C. 

      Greywacke

    • D. 

      Conglomerate

  • 7. 
    Which of the following is not a type of limestone?
    • A. 

      Arkose

    • B. 

      Coquina

    • C. 

      Greywacke

    • D. 

      Conglomerate

  • 8. 
    Which of the following sedimentary features would typically be found in shales but not in sandstones?
    • A. 

      Mud cracks

    • B. 

      Cross stratification

    • C. 

      Ripple marks

    • D. 

      Bedding

  • 9. 
    Sedimentary rocks account for about what percentage of the Earth's outermost 10 kilometers of rock (first percentage). Also, what percentage of the Earth's continental area is covered by sedimentary rocks (second percentage)?
    • A. 

      5% & 75%

    • B. 

      3.5% & 100%

    • C. 

      65% & 10%

    • D. 

      85% & 100%

  • 10. 
    Flint, chert, and jasper are microcrystalline forms of ________.
    • A. 

      Quartz

    • B. 

      Hematite

    • C. 

      Halite

    • D. 

      Calcite

  • 11. 
    Detrital sedimentary rocks are classified named based on the
    • A. 

      Colors of the cementing minerals

    • B. 

      Grain sizes of the detriatal particles

    • C. 

      Compositions of soluble minerals

    • D. 

      Degree of compaction and lithification

  • 12. 
      _________ is not a common cementing agent for sandstones.
    • A. 

      Quartz

    • B. 

      Calcite

    • C. 

      Fluorite

    • D. 

      Iron oxides

  • 13. 
    What is probably the single most important, original, depositional feature in sedimentary rocks?
    • A. 

      Sizes of the sand grains

    • B. 

      Degree of lithification

    • C. 

      Bedding or stratification

    • D. 

      Compaction of the mud and clay

  • 14. 
    Which of the following describes the correct order for relative solubility of minerals in sedimentary rocks?
    • A. 

      Evaporate minerals are more soluble than quartz and less soluble than calcite

    • B. 

      Evaporate minerals are less soluble than quartz and calcite

    • C. 

      Evaporate minrals are more soluble than calcite and quartz

    • D. 

      Evaporate minerals quartz and calcite all have the same relative solubility

  • 15. 
    ____cement produces bright-red and yellow colors in some sandsone
    • A. 

      Clay

    • B. 

      Calcite

    • C. 

      Quartz

    • D. 

      Iron oxide

  • 16. 
    Gravwacke is___
    • A. 

      A limestone with abundant, sand-sized quartz grains

    • B. 

      A sandstone with the sand grains embedded in a clay rich matrin

    • C. 

      A dark gray calcite rich mudsone or shale containing pyrite

    • D. 

      A dark, organic rich chemical sedimentary rock containing small crystals of halite

  • 17. 
    What is the main difference between a conglomerate and a sedimentary breccia?
    • A. 

      Breccia clasts are angular; conglomerate clasts are rounded

    • B. 

      A breccia is well stratified; a conglomerate is poorly stratified

    • C. 

      Breccia clasts are the size of baseball; conglomerate clasts are larger

    • D. 

      Breccia has a compacted, clay-rich matrix; conglomerate has no matrix

  • 18. 
    Compaction is a very important part of the lithification process for which of the following sediments?
     
    • A. 

      Gravel

    • B. 

      Sand

    • C. 

      Mud

    • D. 

      Cobble

  • 19. 
    ___________, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.
    • A. 

      Calcite

    • B. 

      Orthoclase

    • C. 

      Quartz

    • D. 

      Biotite

  • 20. 
    ____sandsone contains abundant feldspar suggesting that the sand was derived by wathering and erosion of granitic bedrock
    • A. 

      Quart-rich

    • B. 

      Lignitic

    • C. 

      Arkosic

    • D. 

      Oolitic

  • 21. 
    Which of the following best describes bedded gypsm and halite?
    • A. 

      Detrital sedimentary rocks

    • B. 

      varieties of dolostone

    • C. 

      Varieties of coal and peat

    • D. 

      Evaporates; chemical, sedimentary rocks

  • 22. 
    Which of the following applies to the basic constituents of halite, gypsum, and sylvite?
    • A. 

      Transported as dissolved ions; deposited as detrital mud

    • B. 

      Transported as detrital mud; deposited by evaporation

    • C. 

      Transported as dissolved ions; deposited by evaporation

    • D. 

      Transported and deposited as mud-sized particles

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