Oldest to youngest
Sandstone with trilobite → limestone with crinoid → shale with ammonite → conglomerate
According to the rule of superposition, rock strata (layers) that are the furthest from the ground's surface are the oldest (formed earliest) and those that are the nearest to it are the youngest (formed most recently).
A rock is a dense mass of mineral grains that have grown or been cemented together over time. There are big rocks and little rocks. Pebbles are little rocks. One or more minerals can be found in every rock.
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