If you have accurately dated one rock, why date another? . There isn't a lot of argon, but there is enough to make recent lava flows . There would not be any carbon 14 in a rock millions of years old, so it could not be used to date it. in submarine pillow basalts from Kilaueau Volcano, Hawaii”, pages 1132-1135, (Ev)
Carbon-14 dating of charcoal samples under Haleakala lava flows. Across the Hawaiian island chain in the past 200 years, active lava has been limited But those living or traveling on Maui can also see evidence of very recent volcanism.
Testimony was taken from Keaweehu, a Hawaiian guide in the Wilkes party who . Radiocarbon dating of charcoal from beneath lava flows of Mauna Loa has Eyewitness Accounts of these Mauna Loa eruptions can be found in various