THE closing years of the nineteenth century witnessed a revival of interest in the petrology of gneous rocks, which must be regarded as marking an important stage in the development of that subject.

This is a preview. Log in through your library . Current issues are now on the Chicago Journals website. Read the latest issue.One of the oldest journals in geology, The Journal of Geology (JG) has ...

In the last edition of our ongoing series on how planets get ore– those wonderful rocks rich in industrial minerals worth ...

The Journal of Geology, Vol. 46, No. 3, Part 2 (Apr. - May, 1938), pp. 505-520 (16 pages) A modified variation diagram for plotting groups of chemical analyses of ...

In my last column, I wrote about the locations where you can find igneous rocks that were formed from lava. The metarhyolite and metabasalt described in the column are known as extrusive rocks, those ...

Scientists drilled the deepest core yet, reaching near Earth's mantle, uncovering unique geological samples and offering new ...

With house-size boulders tumbled across its scarred surface and slanted, twisted peaks looming over its iconic namesake trees, Joshua Tree National Park’s preternatural terrain evokes extraterrestrial ...

York County residents often travel somewhere in the world to visit a well-known locality. These locations are often natural exposures of rocks or maybe a combination of the actions of “Mother Nature” ...

We often talk about climate change, melting glaciers, or strange landforms. But we rarely think about something that’s always around us– rocks. They don’t make the news, but they’re everywhere. We ...

One main goal of NASA's Mars 2020 mission is to determine when conditions on the planet were conducive to the formation of liquid water. Hence the target Jezero crater, seemingly a lakebed with a ...