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23 Cards in this Set

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