( ( ( Original Horizontality ) ( This principle ) ) ( ( says ( ( ( that ( ( sedimentary ( rock layers ) ) ( are ( ( laid ( down flat ) ) originally ) ) ) ) and ) ( that ( ( if ( you ( find ( ( sedimentary layers ) ( which ( ( are not ) flat ) ) ) ) ) ) ( , ( they ( have ( been ( deformed ( since deposition ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Original) (NNP Horizontality)) (NP (DT This) (NN principle))) (VP (VBZ says) (SBAR (SBAR (IN that) (S (NP (JJ sedimentary) (NN rock) (NNS layers)) (VP (VBP are) (VP (VBN laid) (ADVP (RB down) (JJ flat)) (ADVP (RB originally)))))) (CC and) (SBAR (IN that) (S (SBAR (IN if) (S (NP (PRP you)) (VP (VBP find) (NP (NP (JJ sedimentary) (NNS layers)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (RB not) (ADJP (JJ flat))))))))) (, ,) (NP (PRP they)) (VP (VBP have) (VP (VBN been) (ADJP (VBN deformed) (PP (IN since) (NP (NN deposition)))))))))) (. .)))
Original Horizontality This principle says that sedimentary rock layers are laid down flat originally and that if you find sedimentary layers which are not flat, they have been deformed since deposition.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (JJ sedimentary) (NN rock) (NN layer)) (VP (VBZ is) (RB not) (ADJP (JJ horizontal))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (VBN deformed))) (. .)))