( ( ( The rocks ) ( formed ( during ( these times ) ) ) ) ( ( contain ( many ( important ( marine ( animal fossils ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS rocks)) (VP (VBN formed) (PP (IN during) (NP (DT these) (NNS times))))) (VP (VBP contain) (NP (JJ many) (JJ important) (JJ marine) (NN animal) (NNS fossils))) (. .)))
The rocks formed during these times contain many important marine animal fossils.
(ROOT (S (NP (NP (DT The) (NN presence)) (PP (IN of) (NP (NP (DT an) (NN animal) (NN fossil)) (PP (IN in) (NP (DT a) (NN rock)))))) (VP (VBZ gives) (NP (NP (NN evidence)) (PP (IN of) (NP (DT the) (NN time) (NN period)))) (NP (NP (DT the) (NN animal)) (VP (VBN lived) (PP (IN in))))) (. .)))
The presence of an animal fossil in a rock gives evidence of the time period the animal lived in.