Under a swath of Kentucky hills and hollows is a limestone ... and new caves are continually being discovered. Two layers of stone underlie Mammoth's hilly woodlands. A sandstone and shale cap ...

There are suitable activities for every season, including exploring the weathered caves and sandstone archways by kayak, ...

Basalt rock comprises most of County Antrim’s geological map, while sandstone and slate ... to a quarry in the Mournes. The limestone in the Marble Arch Caves formed around 330 million years ...