<P> A dome is a feature in structural geology consisting of symmetrical anticlines that intersect each other at their respective apices . Intact, domes are distinct, rounded, spherical - to - ellipsoidal - shaped protrusions on the Earth's surface . However, a transect parallel to Earth's surface of a dome features concentric rings of strata . Consequently, if the top of a dome has been eroded flat, the resulting structure in plan view appears as a bullseye, with the youngest rock layers at the outside, and each ring growing progressively older moving inwards . These strata would have been horizontal at the time of deposition, then later deformed by the uplift associated with dome formation . </P> <P> There are many possible mechanisms responsible for the formation of domes, the foremost of which are post-impact uplift, refolding, and diapirism . </P>

Where are the oldest rocks found in a dome
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