( ( From ( ( these ( ( fossils and ) impressions ) ) ( in ( sedimentary rock ) ) ) ) ( , ( we ( ( can ( tell ( what ( ( kind ( of ( ( plants and ) animals ) ) ) ( ( lived ( at ( a ( certain period ) ) ) ) ( in ( the ( very ( ancient past ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN From) (NP (NP (DT these) (NNS fossils) (CC and) (NNS impressions)) (PP (IN in) (NP (JJ sedimentary) (NN rock))))) (, ,) (NP (PRP we)) (VP (MD can) (VP (VB tell) (SBAR (WHNP (WP what)) (S (NP (NP (NN kind)) (PP (IN of) (NP (NNS plants) (CC and) (NNS animals)))) (VP (VBD lived) (PP (IN at) (NP (DT a) (JJ certain) (NN period))) (PP (IN in) (NP (DT the) (RB very) (JJ ancient) (NN past)))))))) (. .)))
From these fossils and impressions in sedimentary rock, we can tell what kind of plants and animals lived at a certain period in the very ancient past.
(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.