![]() ![]() “Once you’ve crushed the rock, you free the minerals within, and then you can date them, and identify the chemical signature of the volcanic glass that holds the minerals together.” “Each eruption has its own fingerprint – its own evolutionary story below the surface, which is determined by the pathway the magma followed,” said Vidal. The researchers collected pumice rock samples from the volcanic deposits and ground them down to sub-millimeter size. ![]() Credit: Al DeinoĪs part of a four-year project led by Professor Clive Oppenheimer, Vidal and her colleagues have been attempting to date all the major volcanic eruptions in the Ethiopian Rift around the time of the emergence of Homo sapiens, a period known as the late Middle Pleistocene. Researchers at the Omo Kibish geological formation in southwestern Ethiopia.
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