Less than 6,960 years before present, a basaltic andesite-andesite ash of yellow ochre colour was erupted from Mentolat. The yellow-grey MEN2 ash has been dated by radiocarbon dating to be over 90 ± 30 years before present. This eruption had a minimum volume of . Additional tephra layers indicate eruptions less than 2,560 and 4,320 years ago, along with a number of smaller eruptions.