NASA’s Perseverance rover discovers 3.9-billion-year-old rock layer on Mars: All we know about it

NASA’s Perseverance rover has made another exciting discovery on Mars, finding a huge 245-foot-thick rock layer near the edge of Jezero Crater. Scientists believe this rock formation, called the Broom Point member, is more than 3.9 billion years old, one of the oldest geological formations ever studied on the Red Planet.The discovery can help researchers understand what Mars looked like when the Solar System was still very young, and asteroid impacts were common. While exploring the area, the rover found six different types of rocks, including pieces that look like they have melted. Scientists also noticed hot molten rock may have been mixed with water or ice long ago.

As per NASA, Ken Farley, Perseverance deputy project scientist at Caltech in Pasadena, California, said, “Since leaving Jezero, Perseverance has been exploring a brand-new frontier, both geographically and geologically — a chapter of Martian time that predates the crater itself.
“On Earth, our earliest geologic history has been fundamentally broken up, deformed, and erased by plate tectonics. Because Mars lacks plate tectonics to recycle its crust, this ancient record remains intact, giving us a rare glimpse into a geological time period that doesn’t exist on our own planet.”According to another researcher, Alex Jones, a PhD student in planetary geology at Imperial College London, the different rock layers show that Mars was hit by many asteroids for a long period. Some of these impacts were large and happened far away, while others were smaller and took place closer to the area that was examined by the Perseverance rover.

After reaching the Jezero Crater in 2024, NASA’s Perseverance rover began studying the rocks using its scientific instruments. At Broom Point, the rover identified six different types of rocks, including breccias, which are rocks made from broken pieces joined together and layers of rock dust. Tiny, dark, glass-like beads were also found in the rock layers, which gave researchers more clues about how these ancient rocks were formed billions of years ago.