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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When the contacts between sedimentary rock units form a series of parallel lines with the youngest unit in the center, it is typically indicative of a syncline, which is a downward-folded layer of rock. The opposite, with the oldest layer in the center and younger layers on either side, would indicate an anticline, while a circular pattern would indicate a dome and a bowl-shaped pattern would indicate a basin.

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