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Chapter 6: Sedimentary Rocks
Key Terms for Chapter 6: Sedimentary Rocks
35
Geology
Undergraduate 1
11/16/2010

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Term
Arkose
Definition
Sedimentary rock made of sand-sized grains with quartz & feldspar
Term
Bed
Definition
Single layer of sedimentary rock with a recognizable top or bottom
Term
Biochemical Sedimentary rock
Definition
Composed of shells
Term
Breccia
Definition
Fragments cemented together in a rock
Term
Cementation
Definition
Phase of lithification in cement, meinerals from groundwater, that fills the spaces between clasts & attached grains.
Term
chemical Sedimentary rock
Definition
Made of minerals from groundwater
Term
Clastic Sedimentary rock
Definition
Cemented fragments & grains from preexisting rocks
Term
Clasts
Definition
Grains
Term
Conglomerate
Definition
Buried & lithified rounded clasts.
Term
Cross bed
Definition
Lamination inclined to the main bedding; represents the slip face of a layer deposited in a current.
Term
Deposition
Definition
Process od sediment settling out of transporting minerals.
Term
Diagenesis
Definition
Physical, chemical, and biological process that transforms sediments into rock.
Term
Dolostone
Definition
Carbonate rock with the mineral dolomite; forms by a chemical reaction between calcite & magnesium groundwater.
Term
Erosion
Definition
Process that seperated rock from its substrate & carried it away.
Term
Evaporite
Definition
Salt deposits from evaporation.
Term
Graded bed
Definition
Layers of sediment in which grain sizes vary from coarse at the botton to fine at the top.
Term
Limestone
Definition
Sedimentary rock composed of calcite.
Term
Lithification
Definition
Transformation of loose sediments into rock.
Term
Mudstone
Definition
Sedimentary rock composed of lithified mud.
Term
Organic Sedimentary Rock
Definition
Consists of carbon-rich plants
Term
Regression
Definition
The seaward migration of a shoreline cause by a lowering sea level.
Term
Ripple Marks
Definition
Small, elongated ridges which form on a bed surface at right angle to the direction of the current flow.
Term
Sandstone
Definition
Coarse-grained sedimentary rocks made of quartz
Term
Sedimentary Basin
Definition
Sediment filled depression
Term
Sedimentary rock
Definition
Rock that forms at or near the surface of the Earth by the cementing together of loose grains.
Term
Sedimentary Structure
Definition
Layering of sedimentary rocks, for surface features on layers formed during deposition, & for the arrangement of grains with layers.
Term
Shale
Definition
Very-fined grained sedimantary rock that breaks into sheets.
Term
Siltstone
Definition
Fine grained sedimentary rock generally composed of very small quarts grains.
Term
Sorting
Definition
The degree to which the clasts in a rock are all the same size ot include a variety of sizes.
Term
Strata
Definition
Several beds together
Term
Stratigraphic Formation
Definition
Sequence of strata distinctive enough to be traced across a fairly large region.
Term
Subsidence
Definition
Sinking of lithosphere.
Term
Transgression
Definition
The inland migration of shoreline resulting from a rise in sea level.
Term
Travertine
Definition
Rock composed of crystalline calcium carbonate formed by chemical precipitation from groundwater (hot- or cold-springs or cave walls)
Term
Turbidity Current
Definition
Moving submarine suspension of sediment.
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