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High-resolution images from Mars Global Surveyor's Mars Orbiter Camera (MOC) have revealed several virtually craterless regions in the Amazonis and Elysium plains that were resurfaced by lava flows as recently as 10 million years ago--practically yesterday on a geological time scale.
From 1992 to 2000 Gallant ranged across Siberia, exploring seven different impact areas, including the craterless blast site of the 1908 Tunguska event and the 100-kilometer-wide Popigai crater in northern Siberia.