Direct sunlight, extreme temperature differences, and long periods of drought define the severe microclimates of the Inselberg Savane-Roches, or “jungle rocks”. Over two hundred of these granite domes dot the interior of French Guiana, forming the last remnants of the 1.7 billion year old Guiana Shield that ranges from Venezuela to Amapá in Brazil.

Before the 2003 completion of a road between…

Located on the southern flank of Eldon Hill (etymologically "Elves' Hill"), the peaceful landscape has a hidden evil scar of just a hundred feet long and twenty feet wide.

Long before 18th-century geologists dared to measure its depth, Eldon Hole was feared as a "bottomless pit." In 1636, the philosopher Thomas Hobbes famously wrote of a stone dropped into the abyss: "The lowest deep descending,…

Utah’s Great Chamber, a sandstone alcove over 200 feet wide, is the awe-inspiring result of millions of years of wind and sand shaping rock.

The Chamber was created when erosion ate into the side of a Navajo sandstone cliff formed from dunes 180 million years ago in the Jurassic period. The key geologic factor here is "differential erosion," in which softer rock erodes quicker than the…