Put simply, limestone is a type of rock that is formed by organisms ... on the ins and outs of these two materials. Read more ...

Mysterious micro-burrows in desert marble and limestone were probably made by microbes that lived millions of years ago. Exactly what kind of microbes bored into the rock remains unknown ...

Unusually small burrows, i.e., tiny tubes that run through the rock in a parallel arrangement from top to bottom, were discovered in marble and limestone of these desert regions. In the desert ...

LIMESTONE COUNTY, Ala. (WHNT) — Construction on a controversial rock quarry will remain at a ... on the quarry in Belle Mina marking another small victory for people living there.