17.The marshy conditions of the dinosaur freeway (the reason its footprints formed, and have survived) may, though, have favoured crocodilians over predators that had evolved on drier land.
19.With a definition, of course, something like a marshy area of land where the soil near the surface is saturated or covered with water forming a special habitat for wildlife.
20.And the bonebed was formed in a marshy, aquatic environment - one that dried out from time to time, based on the plant remains that have been found there.