( ( ( An ( esker opposite ) ) ( ( ( the junction ) ( of ( Stone ( and ( Washington Streets ) ) ) ) ) ( is ( ( a ( serpentine ridge ) ) ( of ( unstratified ( ( sand and ) gravel ) ) ) ) ) ) ) ( ( ( deposited ( by ( ( a stream ) ( in ( a cavern ) ) ) ) ) ( under ( the ice ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (NN esker) (NN opposite)) (SBAR (S (NP (NP (DT the) (NN junction)) (PP (IN of) (NP (NNP Stone) (CC and) (NNP Washington) (NNPS Streets)))) (VP (VBZ is) (NP (NP (DT a) (JJ serpentine) (NN ridge)) (PP (IN of) (NP (JJ unstratified) (NN sand) (CC and) (NN gravel)))))))) (VP (VBD deposited) (PP (IN by) (NP (NP (DT a) (NN stream)) (PP (IN in) (NP (DT a) (NN cavern))))) (PP (IN under) (NP (DT the) (NN ice)))) (. .)))
An esker opposite the junction of Stone and Washington Streets is a serpentine ridge of unstratified sand and gravel deposited by a stream in a cavern under the ice.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN esker)) (VP (VBZ is) (NP (NP (DT a) (JJ winding) (NN ridge)) (PP (IN of) (NP (NN sand))) (SBAR (S (VP (VBD deposited) (PP (IN by) (NP (NP (DT a) (NN stream)) (PP (IN of) (NP (NP (NN meltwater)) (VP (VBN called))))))))))) (. .)))