After drilling in an area on Mars dubbed the “clay-bearing unit,” two new samples have the highest amounts of clay minerals ever found on the Red Planet. Curiosity began drilling the two rock targets, called “Aberlady” and “Kilmarie,” in early April, and then used its mineralogy instrument to analyze the rock samples.
Because clay often forms when there’s water present and water is a condition for life, this is a sign that could further scientists’ search to figure out if there was ever microbial life on Mars. Although these findings aren’t direct proof there was ever life on Mars, according to a press release, it’s likely that these samples came from ancient martian lakes, which may have offered an ideal home for life.
The find occurred near the lower side of Mount Sharp, and adds to other results from Curiosity that show there was once a significant amount of water in Gale Crater, where the rover landed in 2012. Future drilling will continue in the clay-bearing area as scientists work on finding out what makes this ridge and area of Mars different, along with working on unlocking more clues to piece together the history of Mars.