At first glance the rocks that make up Greenland's Isua supracrustal belt look just like any modern basalt you'd find on the sea floor. But this outcrop, which was first described in the 1960s ...

Basalt underlies much of New Jersey ... parking lots and other human infrastructure. This particular outcrop, about 400 feet long, was exposed when people cut into a hillside to create a narrow ...

The tallest point in the middle of the wilderness, this 200-foot-tall outcrop looks like a gigantic cracked egg. Most of the runny basalt lava that flooded this area welled up from a vent here. In ...