( ( On ( ( the ( both sides ) ) ( of ( this fault ) ) ) ) ( , ( there ( ( are ( ( ( ( ( Mesozoic rocks ) , ) ( ( a combination ) ( of Triassic ) ) ) and ) ( ( Jurassic rocks ) ( that ( are ( surrounded ( by ( ( Cretaceous rocks ) ( on ( the ( both sides ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN On) (NP (NP (DT the) (DT both) (NNS sides)) (PP (IN of) (NP (DT this) (NN fault))))) (, ,) (NP (EX there)) (VP (VBP are) (NP (NP (JJ Mesozoic) (NNS rocks)) (, ,) (NP (NP (DT a) (NN combination)) (PP (IN of) (NP (NNP Triassic)))) (CC and) (NP (NP (JJ Jurassic) (NNS rocks)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN surrounded) (PP (IN by) (NP (NP (JJ Cretaceous) (NNS rocks)) (PP (IN on) (NP (DT the) (CD both) (NNS sides)))))))))))) (. .)))
On the both sides of this fault, there are Mesozoic rocks, a combination of Triassic and Jurassic rocks that are surrounded by Cretaceous rocks on the both sides.
(ROOT (S (NP (DT A) (NN fault)) (VP (VBZ is) (NP (NP (DT the) (NN fracture)) (VP (VBN caused) (SBAR (WHADVP (WRB when)) (S (NP (NP (NNS rocks)) (PP (IN on) (NP (DT both) (NNS sides)))) (VP (VBP move))))))) (. .)))