( Fossils ( ( ( are mostly ) ( found ( in ( ** ( A. ( sedimentary rock ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Fossils)) (VP (VBP are) (ADVP (RB mostly)) (VP (VBN found) (PP (IN in) (NP (NNP **) (NNP A.) (JJ sedimentary) (NN rock))))) (. .)))
Fossils are mostly found in **A. sedimentary rock.
(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)))))))))) (. .)))