In the report on the blue heron rookery, Ralph White, a retired park naturalist and manager of the James River Park system, says that more fish and mammals live at the falls of the James than any other part of the river.
In this segment, he explains the geological conditions that allowed for this to happen. He also touches on the fact that Richmond is on a seam of granite that stretches for a thousand miles - all the way from New Jersey to Georgia. His explanation touches on the theory of plate tectonics. He calls this geological feature “the scar that was left by the collision of North America and Africa.”