Question

Upward arching rock layer

Answer 1

This is called a anticline.
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Answer 2

The answer is "anticline".

Rock layers in compression react comparably into up-arched (which is convex upward) folds called anticlines and down-arched, which is concave descending) folds known as synclines.  

Anticlines and synclines likewise have an axial plane that associates the purposes of most extreme arch of each collapsed layer and partitions the folds into equal parts, every one of which is a limb. Regularly anticlines and synclines are found in an arrangement with one exchanging with the other, so two nearby overlays share a limb. The terms anticline and syncline allude just to collapsed shake layers, and they don't really compare to high and low zones on the surface.