Udaipur Kiran. A meteorite discovered in the Sahara Desert, named Teghaza 001, has been identified as a piece of Mars that formed more than 4.1 billion years ago. This makes it one of the oldest Martian. An 800-gram Martian meteorite found in Mali reveals evidence of ancient water on Mars and offers clues to the planet's 4.1-billion-year-old crust.