native asphalt
native asphalt
[′nād·iv ′as‚fȯlt] (geology)
Exudations or seepages of asphalt occurring in nature in a liquid or semiliquid state. Also known as natural asphalt.
natural asphalt
Asphalt occurring in nature, produced from petroleum by natural evaporation or distillation; usually not suitable for paving purposes until refined and softened to proper consistency by combining with flux oil.