( It ( ( is ( based ( on ( sedimentary ( ( rocks and ) fossils ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (JJ sedimentary) (NNS rocks) (CC and) (NNS fossils))))) (. .)))
It is based on sedimentary rocks and fossils .
(ROOT (S (NP (JJS Most) (NNS fossils)) (VP (VBP are) (VP (VBN found) (PP (IN in) (NP (JJ sedimentary) (NNS rocks))) (SBAR (IN because) (S (NP (NNS organisms)) (VP (MD can) (VP (VB be) (VP (VBN preserved) (PP (IN in) (NP (JJ sedimentary) (NN rock)))))))))) (. .)))