Folded layers of rock can form a wavelike pattern of troughs and crests.Which do the layers near the crest (i.e.the upward fold)form?

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The layers near the crest of a folded rock formation would form an anticline, which is a type of fold in which the rock layers are warped into an arch-like shape with the oldest layers at the core and the youngest layers at the periphery. This is in contrast to a syncline, which is a trough-like fold in which the youngest layers are at the core and the oldest layers are at the periphery. A tension zone refers to an area where rock is being stretched or pulled apart, and a thrust fault is a type of fault where one block of rock is pushed over another block. Neither of these terms accurately describes the shape of folded rock layers near the crest of a fold.

Folded Layers of Rock Can Form a Wavelike Pattern of Troughs