| − | {{move|Law of superposition}}
| + | 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> |