In folded rocks with axial-planar slaty cleavage, the intersection lineation formed where bedding and cleavage planes meet is parallel to the fold axis; when this cleavage-bedding intersection lineation is horizontal and the cleavage (axial) surface itself is vertical (upright), this combination indicates that the fold has a vertical (upright) axial surface and a horizontal (non-plunging) fold axis, meaning the fold is classified as an upright, non-plunging fold.
The cleavage-bedding intersection lineation is a linear structure formed at the intersection of the (axial-planar) cleavage surface and bedding, and its orientation is parallel to...
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