Sahara meteorite Teghaza 001 is rare 4.1-billion-year slice of ancient Mars crust
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A NASA Jet Propulsion Laboratory team led by Yang Liu dated Teghaza 001, a Martian meteorite found in Mali's Sahara in 2022, to at least 4.1 billion years old. It is only the third known ancient Mars rock on Earth after Allan Hills 84001 and Black Beauty; most Martian meteorites (shergottites, nakhlites, chassignites) are 2.4 billion years old or younger despite much of Mars's surface being over 3 billion years old.
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