For most organisms on Earth, rocks are objects, not food. But for one oddball microbe, desert limestone seems to have been on ...

Mysterious tunnels in desert rocks may be the work of unknown microbes, hinting at a hidden world inside marble and limestone ...

In the desert areas of Namibia, Oman, and Saudi Arabia, research work has revealed unusual structures that are probably due ...

The aqua blue waters lap the rock formations, and in some cases, blast water through crevices in the Anastasia limestone, which gave the preserve its name. My son regularly climbs barefoot on the ...

The DePauw Nature Park was the site of an active limestone quarry from 1917 to 1977. The limestone rock began forming 350 million years ago from the remains of animals living on the bottom of an ...

Rockport State Recreation Area is known to have exposed fossils from the Devonian period – more than 400 million years ago.

CONNOR: Good thinking! I read a bit about limestone on the bus journey. Limestone is a sedimentary rock created by layers of skeletons and shells of sea creatures found in ancient, warm ...