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1. If both limbs of overturned fold have same dip angle , we call this special overturned fold isoclinal fold.
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2. In the inner part of the rock, we found that stratigraphic gap and inversion, and the fold-shapes show a series of pitching fold, appressed homoclinal fold and recumbent.
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3. There are three basic type faults, that is, fault-propagation fold, fault-bending fold and detachment fold. All of them are important hydrocarbon traps.
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4. a sheath fold looks like a scabbard or human's tongue. Its fold axial plane or flattened plane is parallel to the foliation and there is strong stretching lineation on the sheath fold.
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5. If both limbs of overturned fold have same dip angle , we call this special overturned fold isoclinal fold.
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