The simple tools were made out of local quartz, chert and limestone, said study co-author Xosé Pedro ... "Pink" provides further evidence that the Atapuerca Mountains formed an important corridor rich ...

Seasoned conservator Ivan Myjer is replacing pieces of San Antonio's "major achievement" in historic construction.

Since the bedrock through which the cave formed is made of limestone, that's the most common ... One of the most interesting rocks, though, may be chert or flint, which looks like blackish gray ...

The limestone and chert formations were once ancient seabeds, formed when this entire region was submerged beneath shallow seas during the Mississippian Period, roughly 350 million years ago. Over ...

The limestone and chert formations were once ancient sea beds, formed when this entire region was submerged beneath shallow seas during the Mississippian Period, roughly 350 million years ago. Over ...

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

In the desert areas of Namibia, Oman, and Saudi Arabia, research work has revealed unusual structures that are probably due to the activity of an unknown microbiological life form. Unusually small ...

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