Tarmack is a reference to a discovery by a man named MacAdams. MacAdams found that crushed rock, as opposed to pea gravel, could be compacted into a firm and durable surface if mixed with asphalt tar and compacted.'Tarmac is a term almost universally misused to describe an airports runway, which are always concrete, not blacktop, paving, or tarmack.
Driving through the California motherload, we could see remains of the tarmack that once was the surface of the main road.
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