( Stratigraphy ( ( ( The science ) ( of ( studying ( layers ( of ( ( ( ( ( materials , ) ( as ( in ( ( rock layers ) ( in ( the Earth ) ) ) ) ) ) , ) or ) ( deposits ( in ( archaeological sites ) ) ) ) ) ) ) ) ) . ) )
(ROOT (FRAG (ADVP (RB Stratigraphy)) (NP (NP (DT The) (NN science)) (PP (IN of) (S (VP (VBG studying) (NP (NP (NNS layers)) (PP (IN of) (NP (NP (NP (NNS materials)) (, ,) (ADVP (RB as) (PP (IN in) (NP (NP (NN rock) (NNS layers)) (PP (IN in) (NP (DT the) (NN Earth))))))) (, ,) (CC or) (NP (NP (NNS deposits)) (PP (IN in) (NP (JJ archaeological) (NNS sites))))))))))) (. .)))
Stratigraphy The science of studying layers of materials, as in rock layers in the Earth, or deposits in archaeological sites.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (NN rock) (NNS layers)))) (ADVP (RB stratigraphy))) (. .)))