In geology, even small layers can tell big stories. But figuring out the origins of such small layers can be a challenge, ...

The West Yellowstone rhyolite lava flow is located along Highway 20 (between the West Entrance of Yellowstone National Park and Madison Junction). The flow is approximately 111,000 years old and ...

Previously, it was thought that the youngest eruption in the region was the rhyolite lava of the Pitchstone Plateau about 70,000 years ago, while the youngest known basalt flow was 120,000 years old. ...

Rhyolitic lava: 1292 to 1652 degrees Fahrenheit; ... When magma erupts or flows from the Earth, it is then called lava. There are three types of magma, according to National Geographic: ...

Rhyolitic lava is felsic; the name is derived from feldspar and silica, which are present in high concentrations ... a massive basaltic lava flow covered much of India. The eruptions that created the ...

A slow-moving lava flow made of glass is still inching its way down a volcano in Chile, nearly a year after it first erupted, geologists recently discovered. IE 11 is not supported.

Thundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often made of quartz, chalcedony, or agate. They are nodule-like rocks ...

While Yellowstone’s last lava flow hardened long ago, the emergence of this vent doesn’t spell impending doom. The USGS assures that volcanic risk remains low, noting that the event is a ...

On the other side of the marsh is a tree-covered rhyolite lava flow, and at the base of the flow is a new thermal feature that formed in early August 2024, marked by a plume of steam.

Spanning more than five square miles, the dark, sometimes translucent mass was formed from a rhyolitic lava flow that oozed out of the magma chamber of Yellowstone Caldera beneath the park, and ...