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Geologic Structures

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Rocks and Structures

  • 1. Fractures: cracks in a body of rock

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Rocks and Structures

  • 2. Faults: fractures along which there has been movement

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Rocks and Structures

  • 3. Dikes: igneous rock that forms in faults when magma is forced through the fault and cools

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Rocks and Structures

  • 4. Folds: occur when layers (strata) of rock are squeezed and buckle

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Rocks and Structures

  • 5. Erosion surfaces: occur when a rock surface is exposed to erosion and then reburied