Plastistones, a new type of sedimentary rock that’s part-plastic and part-rock, has been found on at least five continents and 11 countries.

Cheyava Falls, a spot-covered rock, may have signs that Mars once hosted microbial life. NASA/JPL-Caltech/MSSS The specimen was found on the northern edge of Neretva Vallis, an ancient river ...

Since July, NASA’s Perseverance rover has drilled and collected four slim cores of sedimentary rock, formed in what was once a lake on Mars. They are the first of this type of rock to be ...