On a geologic map, if the contacts between sedimentary rock units forms a bull's eye pattern of concentric circles, with the YOUNGEST unit in the center, the underlying structure is Syncline.
A syncline is a fold in structural geology that has younger layers closer to the structure's center. A huge syncline with smaller folds superimposed is called a synclinorium .
When tectonic plates move in the same direction, the crust is compressed and forced upward, creating synclines. The massive land masses that make up the Earth's crust and upper mantle are known as tectonic plates. Many of the landforms on Earth were formed as a result of the movement and shifting of these plates over time.
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