Geology Final Exam: Sedimentary Rocks
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What are the major classifications of sedimentary rocks?
- Composed mainly of rock or mineral particles from weathering
- Soluble material precipitated from an aqueous solution
- BiochemicalSoluble material precipitated from by an organism
Describe the texture and composition of siliciclastic rocks and list common examples?
Composed of pieces (clasts) of rocks/minerals
- Grain Shape
- Well Rounded
- Grain Sorting
- Well Sorted
- Moderately Sorted
- Poorly Sorted
What sedimentary rock reacts with acid and what mineral is it composed of?
Limestone composed of calcite
What is the most abundant sedimentary rock?
Describe some sedimentary structures.
Cross-bedding - beds deposited by wind or water layered down at an angle
Graded-bedding - deep-sea sediments deposited by turbidity currents with particle sizes becoming finer upwards
Ripples - small ridges of sand or silt formed by water or wind currents
Mud Cracks - evaporated water leaving behind solid mud
Define depositional environment.
Setting where sediments accumulate and sedimentary rocks form.
Examples of depositional environment
- Sand Dunes
- Alluvial Fans
- Glacial Deposits
In what depositional environment might you find cross-bedding?
Rivers or streams
In what depositional environment might you find mud cracks?
In what depositional environment might you find ripple marks?
In what depositional environment might you find fossils?
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