Mars is thought to have had a watery past, but when exactly it transitioned to its dry and dusty present is up for debate. Now, though, a team of scientists studying the marks on a young Martian crater has found signs that waterlogged debris flowed down the Red Planet’s slopes surprisingly recently — within the last million years.

The findings, described in the journal Nature Communications, help to fill in an increasingly complex picture on the recent Martian water cycle and have implications for the possibility of life.

The European scientists looked at the mid-latitude Istok crater, which has so many well-defined gullies running down its steep sides that they overlap.