( This ( ( is ( ( a ( ( relatively undisturbed ) region ) ) ( of ( horizontal ( sedimentary rocks ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT a) (ADJP (RB relatively) (JJ undisturbed)) (NN region)) (PP (IN of) (NP (JJ horizontal) (NN sedimentary) (NNS rocks))))) (. .)))
This is a relatively undisturbed region of horizontal sedimentary rocks.
(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)))))) (. .)))