Troy Meadows is a 3,100-acre (1,300 ha) nature preserve in Parsippany, Morris County, New Jersey.

[3] Around 400 million years ago, a small continent long and narrow collided with proto North America.

Then around 350 million years ago, the African plate collided with North America creating the folding and faulting in the Appalachians.

But when the African plate pulled away from North America, an aborted rift valley was created.

From Parsippany and the Boonton area the half graben goes east to the western side of Paterson, were there was another fault by the lava flows.