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Untitled Document
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Images of Tectonic Processes and Structures |
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Tectonic
processes are
those that build
up the surface
of the
earth. They are
revealed by
tectonic
structures such
as faults and
folds. Mountain
building is
shown by the
presence of the
mountains
themselves, or
by the presence
of
unconformities
(where
mountain-building
took place in
the past).
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Description |
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Normal and Reverse Faults |
Faults are fractures in rocks that show evidence of movement. Faults can be formed by extension of the crust, compression, or shearing. Each of the faults are different. Pictures in this collection include normal (extensional) and reverse (compression) faults. |
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Strike-slip Faults |
Strike-slip faults are produced by shearing stresses that produce lateral motion. By observing the offset of features on the opposite side of the fault from the observer, one can distinguish right lateral and left lateral motion. |
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Folds |
Folds are caused by compressional forces under pressure, causing the rock to bend rather than fracture. |
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Unconformities |
Unconformities are buried erosion surfaces. In other words, a series of rocks were exposed to erosion, rock was removed, and sedimentation later covered the surface. |
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Mountain Ranges |
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