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

Each piece is carved from a single slab of one of three varieties of Irish limestone. It juxtaposes the textures and ...

Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were ...

Surface water and rain do not flow far on exposed limestone as they rapidly infiltrate into the rock and soil. Where a joint or intersection of joints has been greatly weathered or dissolved ...