On a geologic map,if the contacts between sedimentary rock units form a series of parallel lines,with the youngest unit in the center,the underlying structure is a(n)____________.

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A series of parallel lines on a geologic map with the youngest unit in the center indicates a folding structure called a syncline. In a syncline, the rock layers have been folded downward into a trough, with the oldest rocks in the center and the youngest rocks on the outside of the fold. This is the opposite of an anticline, where the rock layers are folded upward into an arch, with the youngest rocks in the center and the oldest rocks on the outside of the fold. A basin is a type of depression in the rock layers, while a dome is an upward bulge in the rock layers with the oldest rocks in the center and the youngest rocks on the outside.

On a Geologic Map,if the Contacts Between Sedimentary Rock Units