With an area of 170,000 km2 ( 66,000 sq mi ) and a volume of 650,000 km3 ( 160,000 cu mi ) , the Coppermine River flood basalt sequence is larger than the Columbia River Basalt Group in the United States and comparable in size to the Deccan Traps in west-central India .
With an area of 170,000 km2 ( 66,000 sq mi ) and a volume of 650,000 km3 ( 120,000 cubic miles ) , the Coppermine River flood basalt sequence is larger than the Columbia River Basalt Group in the United States and comparable in size to the Deccan Traps in west-central India .