Two unique types of granite formed far from each other before colliding in the Cascades. Towering walls of granite stand sentinel over Highway 20 at Washington Pass deep in the North Cascades. The ...

Cooled magma deposits have been discovered under a lunar volcano that likely erupted 3.5 billion years ago. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...

Petrological, isotopic, and gravity data for a massive granodiorite with K-rich biotite-diorite and tonalite variants in the New England Batholith, Australia, indicate that the more mafic rock types ...

A large formation of granite discovered below the lunar surface likely was formed from the cooling of molten lava that fed a volcano or volcanoes that erupted early in the Moon's history -- as long as ...