Plagioclase feldspar from Edison Butte rhyolite seen at 40x in doubly polarized light. Credit: Erik Klemetti That is a very quick look at how geologists examine rocks, at least using light. It might ...

Beneath Yellowstone lies a magma reservoir, pulsing with molten and superheated rock and exsolved gases. Scientists have long ...

Oregon's state rock is celebrating its 60th anniversary this year. Here's everything to know about the thunderegg and where to find them in Oregon.

WorldAtlas named 8 of Nevada’s strangest landmarks, from creepy motels to desert art and an accidental geyser. Here’s what to ...

Along the way, you'll be treated to stunning, almost otherworldly views of the gorge the river has gouged through the ...

Thundereggs form within volcanic rocks known as rhyolite. As lava flows and hardens into rock, the trapped steam and gases expand, becoming bubbles of silica-rich lava that solidify and ...

Some waterfalls in Yellowstone formed where rocks with differences in hardness meet in these deep gorges, while others formed at the edges of thick rhyolite lava flows. There are approximately 350 ...

How are thundereggs formed, and what makes them unique? Thundereggs form within volcanic rocks known as rhyolite. As lava flows and hardens into rock, the trapped steam and gases expand ...

Plagioclase feldspar from Edison Butte rhyolite seen at 40x in doubly polarized light. Credit: Erik Klemetti That is a very quick look at how geologists examine rocks, at least using light.