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Rock Deformation (Folds (Antiform (Crest points upwards), Synform (Crest…
Rock Deformation
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Rock Deformation
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Stress
Tensional (diverging forces, constructive boundary)
Compressional (converging forces, destructive boundary)
Shear (forces sliding past, conservative boundary)
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Faults
Reverse
HW up, Compressional Stress
Strike-Slip
Horizontal movement, Dextral= right, Sinistral= left, Shear Stress
Normal
HW down, Tensional Stress
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Dip and Strike
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Strike= right angle to dip, parallel to outcrop at surface, left hand rule
Unconformities
Thornton Force
Greywake, below limestone, erosional boundary, below=600ma (Pre-Cambrian), above=300ma (Carboniferous)
Formation
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tops eroded and weathered away to sea level, flooded by sea
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