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15 Cards in this Set
- Front
- Back
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What are sedimentary structures?
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Teatures that form from the sedaments while the sedaments are being deposited.
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How can the current direction be determined from an asymmetrical ripple mark?
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Steep side faces down. Current form in shallow water wave zone.
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How do mud cracks form?
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wet sedaments dry out and shrink and contract..makes tension cracks
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What do swash marks indicate?
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The point of maximum upwash of the waves.
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What is cross stratification?
draw a sketch |
Normally occurs in sand stones, forms by migrating sand dunes or sand bars
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List two organic sedimentary structures
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Tracks/Trails
Burrows |
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Cross-stratification generally occurs in what type of sedimentary rock?
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Sandstone
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What is graded bedding?
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Decrease in grain size upward due to a deposition by turb...
come back to |
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What two things might a geologist learn from studying sedimentary structures?
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Environment depositions
acient current directions |
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The main reasons for stratification in a sedimentary rock are:
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Change in color
Change in grain size Change in rock type |
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Can sedimentary structures for in an igneous rock?
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No
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In what environment do symmetrical ripple marks form?
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Shallow wave zones
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Can the wind form ripple marks?
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yes
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What type of sedimentary structure could a worm form?
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Trails
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The dark sands on the beach are called what kind of minerals?
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Heavy
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