0 a downward, U-shaped fold in the layers of rock in the earth's surface
1 a fold in layers of rock in the earth's surface which curves down
Since the north limb of the syncline is either vertical, near vertical or occasionally overturned the rotation has to be up to or exceeding 90°.
The south limb of the syncline contains proximal arc lavas and volcaniclastic debris, with more distal sediments comprising the north limb.
In these areas, the steeply dipping to overturned short limb of the syncline is preserved.
We think that this syncline is either: (i) a typical normal drag accommodating the slip in the hanging-wall of the bounding high-angle normal fault or (ii) a syn-depositional compaction structure.
The overall depression is neither an area of soft lithologies able to undergo differential erosional lowering, nor a syncline area providing space for sedimentary infilling during post-orogenic times.
The mountain owes it table-top flatness to the fact that it is a syncline mountain, meaning that it once was the bottom of a valley.
Another anticline has been mapped to the north of this ring syncline, which is also concentric with it.
The whole structure of the section is a double plunging syncline with sharp mountain ridges on either side of the valley.
