An Explosion Crater: Pocket Basin
Geologists have found evidence that Pocket Basin is the crater left from a hydrothermal explosion (or steam explosion) some 10,000 years ago. As the region warmed, glaciers started to …
Category: National
About Yellowstone’s Geysers
The number of hot springs in the park has been estimated to be around 10,000; geysers active at any one time number at least 500. No one knows the …
Lower Geyser Basin
Seventeen hot spring groups covering about 5 square miles (13 sq km) nestle in the valley of Lower Geyser Basin. Not all are accessible by trail or boardwalk. The …
Black Water and Travertine Yellowstone
Why are Firehole Lake and some of the nearby springs black? There are large amounts of manganese oxide being deposited, more than anywhere else in the park. In fact, …
Great Fountain Geyser
NOTE: The mileage from the beginning of this side road is given in parentheses. Grand Loop Road mileage continues where Firehole Lake Drive rejoins it. © All thermal features …
Geyserite
As you tour the geyser basins of Yellowstone, you’ll notice that a white or pale gray brittle rock surrounds the geysers and hot springs and forms gravelly areas. The …