( ( ( ( ( ( LAW ( OF ( ( SUPERPOSITION ( Older layers ) ) ( of rock ) ) ) ) ( occur ( on ( bottom ( of profile ) ) ) ) ) , ) and ) ( successively ( ( younger ones ) ( are ( on top ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NN LAW)) (PP (IN OF) (NP (NP (CD SUPERPOSITION) (JJR Older) (NNS layers)) (PP (IN of) (NP (NN rock)))))) (VP (VBP occur) (PP (IN on) (NP (NP (NN bottom)) (PP (IN of) (NP (NN profile))))))) (, ,) (CC and) (S (ADVP (RB successively)) (NP (JJR younger) (NNS ones)) (VP (VBP are) (PP (IN on) (NP (NN top))))) (. .)))
LAW OF SUPERPOSITION Older layers of rock occur on bottom of profile, and successively younger ones are on top.
(ROOT (S (S (NP (NP (JJ Deeper) (NNS layers)) (PP (IN of) (NP (NN rock)))) (VP (MD must) (VP (VB be) (ADJP (ADJP (JJR older)) (PP (IN than) (NP (NNS layers)))) (ADVP (RBR closer) (PP (TO to) (NP (DT the) (NN surface))))))) (, ,) (NP (DT this)) (VP (VBZ is) (NP (NP (DT the) (NN law)) (PP (IN of) (NP (NN superposition))))) (. .)))