More than 1.1 billion years ago, an immense geological fault called the Midcontinent Rift began to form beneath what is now ...

A report by the U.S. Geological Survey said significant reserves of oil and natural gas could be lying thousands of feet ...

The characteristics of the rocks that hold fossils can be as informative as the fossils themselves. There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all ...

Mudrocks, mudstone, and shale comprise about 65% of all sedimentary rocks. Glacial till is unsorted sediment deposited directly by glacial ice. Glacial till is a soft rock identified by large angular ...

Sedimentary rocks, like sandstone and chalk, are made from layers of broken up bits of other rocks and the remains of animals and plants. Over time these are squashed together to form rock.

The McKee Model, taught to many geology students worldwide, posits gradual deepening and gradual shifts in sedimentary ...