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A rule that geologists suggested that should follow when they date rocks according to radiometric ages of crystals inside the rocks that was not date crystals in sedimentary rocks. To make sure that crystals was formed at same time as rock.

Sedimentary rocks are ensured to those types of rock which are formed by the accumulation or mineral  deposition or organic particles at surface of the earth followed by cementation. It is the collective name for processes that cause these particles to settle in place.

Sedimentary rocks is made up of from pre-existing rocks or pieces of once-living organisms. They formed from deposits of minerals that accumulate on the earth's surface.These rocks oftenly have distinctive layering or bedding.

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