Much of our understanding of Earth's past is derived from stratigraphic records exposed in rock outcrops or recovered from drilled cores. These records span immense time intervals, from thousands to ...

What are some events that all of us have had in our lives? Ask the class "What are some events that all of us have had in our lives?" Make a list of 5 or 6 things on the board. Let’s organize these!

Introduction / F.M. Gradstein -- Chronostratigraphy : linking time and rock / F.M. Gradstein, J.G. Ogg and A.G. Smith -- Biostratigraphy : time scales from graphic ...

There's a billion-year gap in Earth's geological history. A new study seeks to explain the mystery.

Geological time, generally considered as a system of eras, periods and epochs materialized in rock strata, might actually follow a simple and unifying model. Indeed, a new study led by physicist Shaun ...

Reston, VA – The U.S. Geological Survey (USGS) and the Association of American State Geologists (AASG) announced that they have developed an updated geologic time scale and color scheme for use in ...

Introduction -- Planetary time scale / Kenneth L. Tanaka and William K. Hartmann -- Precambrian / Martin J. Van Kranendonk, James Gehling, and Graham Shields -- Cambrian period / Shanchi Peng and ...

Every other Friday, the Outside/In team answers a listener question about the natural world. This week’s question comes from Emily in Washington, DC. Crawford Lake in Milton, Ontario. The answer to ...

Every half-million years or so, for unknown reasons, the earth’s magnetic field suddenly flips. Within a period of 10,000 years—a mere instant on the geological time scale—the north and south magnetic ...

Japanese researchers say they are closing in on the mystery of Earth’s “missing” geomagnetic polarity reversals, identifying where they believe scientists should look for evidence of their unusual ...