Text: The gold was washed down from the hills by the River Pactolus; the Greek historian Herodotus relates how flakes of the precious metal were trapped in the fleece of sheepskins spread in the stream-bed, perhaps giving rise to the legend of the Golden Fleece.
Entailment: Gold was washed down from the hills by the river.
Contradiction: The River Thames was the river which washed the gold down.