( ( In ( ( ( ( highly sulfidic ) sediments ) and ) ( ( in ( ( the presence ) ( of ( large amounts ) ) ) ) ( of ( organic matter ) ) ) ) ) ( , ( tetrathionate ( ( was ( present ( in ( ( sediment horizons ) ( ( in which ) ( ( ( ( thiosulfate and ) elemental ) sulfur ) ( also accumulated ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (ADJP (RB highly) (JJ sulfidic)) (NNS sediments)) (CC and) (NP (PP (IN in) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (JJ large) (NNS amounts))))) (PP (IN of) (NP (JJ organic) (NN matter)))))) (, ,) (NP (NN tetrathionate)) (VP (VBD was) (ADJP (JJ present) (PP (IN in) (NP (NP (JJ sediment) (NNS horizons)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (ADJP (JJ thiosulfate) (CC and) (JJ elemental)) (NN sulfur)) (ADVP (RB also)) (VP (VBN accumulated)))))))) (. .)))
In highly sulfidic sediments and in the presence of large amounts of organic matter, tetrathionate was present in sediment horizons in which thiosulfate and elemental sulfur also accumulated.
(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))))) (. .)))