A Look at Pike's Bedrock

PPH:

In the eons that followed, heat and pressure formed a rock deposit that's very
hard and dense. The result: The rock in the Spring Street quarry is some of the
highest-grade raw material in southern Maine for making hot mix asphalt, the
road surface on which we drive. It exceeds the Maine Department of
Transportation's basic requirements for durability and weather resistance.

- John C.L. Morgan