NASA’s Curiosity rover may have just discovered an ancient oasis on Mars.

Rocks enriched in mineral salts provide evidence that ponds may have once dotted the 100-mile-wide Gale Crater.

Researchers believe briny pools likely saw repeated episodes of flooding and drying, leaving behind billion-year-old clues.

The deposits indicate climate variances as the Martian environment transitioned from a wet habitat to a freezing desert. Geek.com reports the NASA rover previously found evidence of freshwater lakes elsewhere on Mars.