( ( ( ( ( Law ( of superposition ) ) ( states ( that ( ( during ( ( the formation ) ( of ( sedimentary rocks ) ) ) ) ( , ( ( each layer ) ( is ( older ( than ( ( ( ( the one ) above ) and ) ( younger ( than ( the ( one below ) ) ) ) ) ) ) ) ) ) ) ) ) ) -- ) ( ( this statement ) ( reflects ( ( the ( relative age ) ) ( of ( sedimentary rocks ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NNP Law)) (PP (IN of) (NP (NN superposition)))) (VP (VBZ states) (SBAR (IN that) (S (PP (IN during) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (JJ sedimentary) (NNS rocks))))) (, ,) (NP (DT each) (NN layer)) (VP (VBZ is) (ADJP (ADJP (JJR older)) (PP (IN than) (NP (NP (NP (DT the) (NN one)) (PP (IN above))) (CC and) (NP (NP (JJR younger)) (PP (IN than) (NP (DT the) (CD one) (RB below)))))))))))) (: --) (S (NP (DT this) (NN statement)) (VP (VBZ reflects) (NP (NP (DT the) (JJ relative) (NN age)) (PP (IN of) (NP (JJ sedimentary) (NNS rocks)))))) (. .)))
Law of superposition states that during the formation of sedimentary rocks, each layer is older than the one above and younger than the one below---this statement reflects the relative age of sedimentary rocks.
(ROOT (S (S (NP (NP (DT The) (NN law)) (PP (IN of) (NP (NN superposition)))) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN by))))) (: :) (S (PP (IN in) (NP (NP (JJ undisturbed) (NNS layers)) (PP (IN of) (NP (JJ sedimentary) (NN rock))))) (, ,) (NP (DT the) (JJS lowest) (NNS layers)) (VP (VBP contain) (NP (DT the) (JJR older) (NNS rocks)))) (. .)))
The law of superposition is best described by: in undisturbed layers of sedimentary rock, the lowest layers contain the older rocks.