[This is the second of three photos that, when seen side by side, form a seamless panorama of a syncline at Ardmore Point. This photo shows the central part of the view.]
A syncline is a down-fold in rock, forming a trough-like shape. The layers of sandstone in this lowest central portion are mostly covered over by sand and pebbles.
In the background, on the far side of the River Clyde, is the section of shoreline between Greenock and Gourock.
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NS3178 : Syncline at Ardmore Point.
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NS3178 : Syncline at Ardmore Point.
(When rock is up-folded instead to form an arch-like shape, this is called an anticline; an example is visible not far away on the same beach:
NS3178 : Anticline at Ardmore Point.)