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Chapter 07
Sedimentary Rocks
28
Geology
Undergraduate 3
09/28/2011

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Term
Sedimentary Rocks
Definition
Rocks where you have an accumulation of loose sediment
Subject sediment to heat and pressure to form a rock
Term
Sedimentary Rock Classification
Definition
Classified by the size of materials or the chemical composition
Term
Sedimentary Rock Types
Definition
Sandstone
Shale
Conglomerate
Limestone
Term
Sandstone
Definition
Created from sand sized particles
Term
Shale
Definition
Very fine grained
Created by clay sized particles
Term
Conglomerate
Definition
Composed of many different sized particles
Term
Limestone
Definition
Calcium Carbonate
Composed of formally living materials
Fossils within limestone
Term
Diagnesis
Definition
Any chemical, physical, or biological change undergone by a sediment
Term
Lithification
Definition
Process in which sediments compact under pressure, and gradually become solid rock
Term
Compaction
Definition
As sediment accumulates the weight of overlying material compresses the deeper sediments
Term
Cementation
Definition
A diagnetic change that involves the crystallization of minerals among individual sediment grains
Term
Clastic Texture
Definition
Rocks that display discrete fragments and particles that are cemented and compacted together
Term
Particle Size
Definition
Effects the rate of chemical weathering
The smaller the particle size, the greater the surface area, the faster the wethering
Term
Distance to source area
Definition
Effects rate of weathering
Term
Sorting
Definition
Degree of similarity in particle size in a sedimentary rock
Term
Roundness
Definition
The degree of sharpness of the corners and edges of a grain
Term
Mature Sediment
Definition
Minerals are all about the same size, well rounded and generally one mineral type
Sand at the beach
Term
Immature Sediment
Definition
Minerals are all different sizes and many types
Term
Evaporites
Definition
Sediment left over when salt water evaporates
Term
Sedimentary Environments
Definition
Places where sediment accumulates
Continental Environments
Marine Environments
Transitional Environments
Term
Sedimentary Structures
Definition
Strata
Bedding Planes
Cross Bedding
Graded Beds
Ripple Marks
Mud Cracks
Fossils
Term
Strata
Definition
Layers of sediment
Also called beds
Term
Bedding Planes
Definition
The area between separating the strata
Term
Cross Bedding
Definition
Layers within the strata that are inclined to the horizontal
Term
Gradded Beds
Definition
The particles within a single sedimentary layer gradually change from coarse at the bottom to fine at the top
Term
Ripple Marks
Definition
Small waves of sand that develop on the surface of a sediment layer by the action of moving water or air
Term
Mud Cracks
Definition
Indicate that the sediment in which they were formed was alternately wet and dry
Term
Fossils
Definition
The remains or traces of prehistoric life
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