A team of geologists has just discovered tiny remnants of prokaryotic and algal life – trapped inside crystals of halite dating back to 830 million years ago.

Halite is sodium chloride, also known as rock salt, and the discovery suggests that this natural mineral could be a previously untapped resource for studying ancient saltwater environments.

Moreover, the organisms trapped therein may still be alive.

The extraordinary study also has implications for the search for ancient life, not just on Earth, but in extraterrestrial environments, such as Mars, where large salt deposits have been identified as evidence of ancient, large-scale liquid water reservoirs.