Earth must have experienced something exceptional 10 million years ago. Our study of rock samples from the floor of the ...

Bedding Contact - The surface or thin zone that separates individual layers of sediment or sedimentary rock from each other. Benthic Communities - Sea floor communities containing different types and ...

These layers of sedimentary rock were deposited in Cambrian time, when another shallow sea covered this region. Among the fossilized remains found within these layers are brachiopods, trilobites ...

Two layers are produced ... This operation could be advantagQously applied to pnrifying rock salt. This salt, which is perceptibly purer than sea salt, nevertheless contains earth and foreign ...

Now researchers led by McNeil have found further supporting evidence for a northern sea ... and among those layers are up to 1,150 feet (350 m) of clay minerals, which form when liquid water soaks ...