Kohala is thought to have last erupted 120,000

Kohala is thought to have last erupted 120,000 years ago. However, several samples of a more recent date have been obtained. Two samples collected about 120 m (394 ft) apart, obtained from Waipiʻo Valley on the volcano's east flank in 1977, were dated reliably to 60,000 years. Another double set of samples, collected from the western part in 1996, was measured to be 80,000 years in age. The samples have been treated with skepticism by the scientific community, and their ages have been directly challenged. The rocks collected from the west site have not been tested by subsequent experiments. The lava collected from the eastern site were allegedly found under a Mauna Loa lava flow, which had been previously dated to 187,000 years. The general agreement is that the flows are 120,000 years at their youngest, conceivably younger.[2]



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