The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities ... other animal groups 65.5 million years ago defines the beginning of the Cenozoic era. We are including ...

Geologists have assigned the present time to the Holocene Epoch of the Quaternary Period, part of the Cenozoic Era, on the time scale of the 4.6-billion-year history of the Earth. However ...

Now, a new study finds evidence of this flood in ridges along the Sicily Sill and in channels that likely formed from this sudden and powerful deluge. Ages, epochs, periods, and even eras are often ...