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

New age data for rhyolite lava flows erupted in the Yellowstone caldera suggest the eruptions occurred in tight clusters, changing the way geologists think about lava flow events and volcanic ...

A mafic volcanic eruption is one characterized by lava flows low in silica and high in iron and magnesium. Rhyolitic lava flows are viscous in nature and form lava domes that are thick and blocky.

In the heart of Oregon’s high desert, just south of Bend, lies a vast volcanic landscape that whispers tales of fire and transformation. This is Newberry Volcano—a colossal, yet often ...

When magma erupts or flows from the Earth, it is then called lava. There are three types of magma, according to National Geographic: Basaltic Andesitic Rhyolitic Each form has its own mineral ...

Rhyolitic lava flows are volcanic flows composed of rhyolite — a high-silica (over 70% SiO2) volcanic rock. This type of lava is known for its high viscosity and relatively low temperature.

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.

Lava can be typed by chemical signature as well. Basaltic lava is mafic, an abbreviation of two of its prevalent elements, magnesium and ferrum, derived from the Latin word for iron. Rhyolitic lava is ...

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 ...

But the stand of trees is hiding a rhyolite lava flow, a thick type of lava that tends to form short, chunky flows throughout the Yellowstone Caldera. The new thermal feature stems from the base ...

The new steam vent is at the foot of a rhyolite lava flow almost 10 feet above the marshland below and is part of an area of warm, hydrothermally altered ground roughly 200 feet long.

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 ...