( Geology ( ( ( The origins ) ( of ( Natural Bridge ) ) ) ( ( lie ( in ( ( the ( Cambrian period ) ) ( of ( ( the ( Paleozoic Era ) ) ( occurring ( ( ( 550 million ) years ) ago ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Geology)) (NP (NP (DT The) (NNS origins)) (PP (IN of) (NP (NNP Natural) (NNP Bridge)))) (VP (VBP lie) (PP (IN in) (NP (NP (DT the) (NNP Cambrian) (NN period)) (PP (IN of) (NP (NP (DT the) (JJ Paleozoic) (NN Era)) (VP (VBG occurring) (ADVP (NP (QP (CD 550) (CD million)) (NNS years)) (RB ago)))))))) (. .)))
Geology The origins of Natural Bridge lie in the Cambrian period of the Paleozoic Era occurring 550 million years ago.
(ROOT (S (NP (NP (DT The) (JJ first) (NN period)) (PP (IN of) (NP (DT the) (JJ paleozoic) (NN era)))) (VP (VBD was) (VP (VBN called) (NP (NN cambrian)))) (. .)))