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Fold Systems: Cleavage-Bedding Relationships |
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One problem that geologists face is to figure out, in poor outcropping area, the succession of anticlinal and synclinal closures adjacent to a given outcrop. The geologist below tries to figure out the position of the next anticline and syncline with respect to the outcrop. The next sketch on the right shows the two possible solutions equally valid unless one considers the cleavage-bedding angular relationship. Looking eastward at the next outcrop (sketch on the right) the succession of rock formation is on the reverse order suggesting that a fold closure has been passed. To find out which of the top of bottom fold system is correct one we must consider that cleavages diverge away and upward in antiformal closures, and away and downward in synformal closures. From the angular relationships between So and S1 there can be only one valid solution which is ... |
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