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The path is a relic of an earlier era, when a railroad cut through the area and a brick furnace raged along the Stillaguamish River, converting limestone into calcium oxide.

Lime is a white caustic powdery substance comprised of calcium oxide, made by heating limestone.

Lime clasts have long been observed in the quicklime, or calcium oxide, that was a mainstay of the Roman empire’s concrete mixtures.

Once you grind calcium oxide into powder and add water, you re-create limestone.

When these are treated at temperature of about 900C, the pellets decompose into a CO2 stream and calcium oxide.