Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known as ...

Highly brecciated pre-Cambrian gneiss, granite, and diabase are described from a core in crystalline rocks directly beneath glacial drift near Manson, Iowa. Surrounding the crystalline mass, whose top ...

Marble is best known for what it can be made into — incredible artworks or tacky ashtrays. But before it was that prized white-grey rock, marble was something a lot more pedestrian — limestone. For ...

Highly detailed fossils are typically found in shale or other fine-grained sedimentary rocks. These ones? They’re made of ...

Stylolites—irregular seams that occur in limestone—have been found to affect how acoustic waves move through rock samples. Laboratory-based insights from KAUST researchers offer an improved ...

While there are several differences between the two, the key difference between limestone and gravel is their compositions. Limestone, made from calcium carbonate, takes millions of years to form.

The Canyon is a Book of Revelations in the rock-leaved Bible of geology. - John Wesley Powell A professor of geology at Illinois Wesleyan, John Wesley Powell had more than just a passing interest in ...

For decades, Illinois has had a state bird and even a state tree, but a state rock hadn't ever been designated, despite more than 30 other states having an official rock or stone. However, that ...