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Oilfield Glossary
Oilfield Glossary
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axial surface

Diagram of parts of synclines and anticlines
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1. n. [Geology]
In folded rocks, the imaginary surface bisecting the limbs of the fold. The axial surface is called the axial plane when the fold is symmetrical and the lines defined by the points of maximum curvature of each folded layer, or hinge lines, are coplanar.