Geologic units containing Basalt
Maximum thickness is about 182 m (597 ft). Orange Mountain Basalt (Lower Jurassic) Orange Mountain Basalt - Basalt, fine-grained to aphanitic, dark-greenish-gray, composed mostly of calcic plagioclase and augite; crystals smaller than 1 mm (0.04 in). Unit consists of three major tholeiitic lava-flow sequences, each about 80 m (262 ft) thick.Web
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