With an area of and a volume of , 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 170000 km2 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 . It compares in size to the Deccan Traps in west-central India .