Characteristics of impact crater Lowell
The impact crater, which is between 3.7 and 3.9 billion years old, is located in the Aonia Terra region of the southern Martian highlands. Over the course of millions of years, Lowell Crater has been altered by erosion and filled with sediments that have levelled the crater floor. Dark sand dunes, gullies and channels created by water run-off are visible along the inner rim of the crater. The impact ejecta are distributed radially over an area of the crater’s surroundings that extends for more than one crater diameter. There, it forms a star-shaped layer of debris that remains clearly visible in some places even today.