The '''law (or principle) of superposition''' states that when [[artifacts]] are found in rock or earth that is layered, the deeper layers hold the older artifacts.<ref>National Park Service: [http://www.nps.gov/archive/maca/learnhome/cur_p_glo.htm#p Paleontology Glossary - Principle of superposition]</ref>
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The '''principle of superposition''' states that when [[artifacts]] are found in rock or earth that is layered, the deeper layers hold the older artifacts.<ref>National Park Service: [http://www.nps.gov/archive/maca/learnhome/cur_p_glo.htm#p Paleontology Glossary - Law of superposition]</ref>