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23 Cards in this Set
- Front
- Back
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What are the four things that classify sediments?
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Texture
Origin Composition Distribution |
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What is the scale of grain size for marine sediments?
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Wentworth Scale
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Arrange these by increasing size: Pebble, Cobble, Sand Granule, Boulder, Clay and Silt
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Clay: 1/4096 to 1/256mm
Silt: 1/256 to 1/16mm Sand: 1/16 to 2mm Granule: 2 to 4mm Pebble: 4 to 64mm Cobble: 64 to 256mm Boulder: above 256mm |
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What scale classifies the shape of sediment?
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Sphericity and Roundness Scale
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What are the degrees of sphericity?
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Very Angular
Angular Sub-Angular Sub-Rounded Rounded Well Rounded |
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What are the degrees of roundness?
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Very elongate to very equant
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What happens to clay content as sediment matures?
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Clay content decreases
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What happens to sorting as sediment matures?
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Degree of sorting increases
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What happens to roundness as sediment matures?
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Roundness increases
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What are the four origin classifications of marine sediment?
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Lithogenous / Terrigenous
Biogenous Hydrogeneous Cosmogeneous |
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Which classification of marine sediments is from precipitation of dissolved materials directly from seawater due to chemical reactions?
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Hydrogenous
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Which sediments are found mostly along the continental margins?
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Lithogenous
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Which sediments come from rivers, glaciers and turbidity currents?
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Lithogenous
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What are the two main types of biogenous sediments?
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Calcium Carbonate
Silica |
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What is the microscopic type of calcium carbonate sediments?
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Calcareous ooze
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What is the macroscopic type of calcium carbonate sediments?
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Shell/coral fragments
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Which biogenous sediments come from cold surface waters?
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Silica
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Which biogenous sediment type do coccolithophors and foraminifers belong to?
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Calcium Carbonates
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Which biogenous sediments are found below the CCD?
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Silica
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What is the CCD?
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Calcite Compensation Depth
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What is the average depth of the CCD?
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4500 meters
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What are condrites?
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Cosmogenous sediments made fo silica.
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What is a "K-T event"?
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The extinction that marks the boundary between the Cretaceous and Tertiary Periods of geologic time.
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