( ( ( Organic ( carbon ( and ( 13dC values ) ) ) ) ( for ( shelf sediments ) ) ) ( ( indicated ( that ( ( ( large amounts ) ( of ( both ( ( ( terrigenous and ) marine ) ( organic carbon ) ) ) ) ) ( are ( being ( ( decomposed ( in ( shelf ( ( waters and ) sediments ) ) ) ) ( to ( fuel ( observed hypoxia ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Organic) (NN carbon) (CC and) (JJ 13dC) (NNS values)) (PP (IN for) (NP (NN shelf) (NNS sediments)))) (VP (VBD indicated) (SBAR (IN that) (S (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (DT both) (ADJP (JJ terrigenous) (CC and) (JJ marine)) (JJ organic) (NN carbon)))) (VP (VBP are) (VP (VBG being) (VP (VBN decomposed) (PP (IN in) (NP (NN shelf) (NNS waters) (CC and) (NNS sediments))) (S (VP (TO to) (VP (VB fuel) (NP (ADJP (JJ observed)) (NN hypoxia))))))))))) (. .)))
Organic carbon and 13dC values for shelf sediments indicated that large amounts of both terrigenous and marine organic carbon are being decomposed in shelf waters and sediments to fuel observed hypoxia.
(ROOT (S (NP (NP (NNS Sediments)) (PP (IN in) (NP (JJ oligotrophic) (NNS lakes)))) (VP (VBP contain) (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (JJ decomposable) (JJ organic) (NN matter))))) (. .)))