This is the principle of cross-cutting relationships. The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).

Middle School (6-8) MS-ESS1-4: Construct a scientific explanation based on evidence from rock strata for how the geologic time scale is used to organize Earth’s 4.6-billion-year-old history.

It’s just as well conditions like this are not common, or 18th-century geologists might have never made sense of Earth's ...

It’s official — you’re living in a new age. It’s called the Meghalayan, and geologists say it's marked by a 'mega-drought' and the collapse of civilizations 4,200 years ago.

Since such rocks were first studied in Cambria so the term Cambrian Period was coined and now used as reference in geological time scale as we meet it in our studies.

In fact, our planet is something of a geological oddball given what we know about our solar system neighbors. Granite isn’t the only rock that’s ordinary on Earth but rare on other worlds.

The world’s first high-definition geologic atlas of the whole Moon on a scale of 1:2.5 million was officially unveiled on April 21. The atlas, both in Chinese and English, includes the Geologic ...