( ( ( The ( sedimentary rocks ) ) ( seen ( along ( the river ) ) ) ) ( ( were ( ( laid down ) ( in ( horizontal layers ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ sedimentary) (NNS rocks)) (VP (VBN seen) (PP (IN along) (NP (DT the) (NN river))))) (VP (VBD were) (VP (VBN laid) (PRT (RP down)) (PP (IN in) (NP (JJ horizontal) (NNS layers))))) (. .)))
The sedimentary rocks seen along the river were laid down in horizontal layers.
(ROOT (S (NP (NP (DT A) (VBG defining) (NN feature)) (PP (IN of) (NP (JJ deformed) (NN sedimentary) (NNS rocks)))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP are) (RB not) (ADJP (JJ horizontal)))))) (. .)))