Two or more eras form an eon, the largest division of geologic time. Some periods are divided into epochs. You can buy a poster of the USGS image above online.

It means "the Anthropocene" will not be added to the chronostratigraphic chart featured in textbooks and on classroom posters to record ... of a new unit of geological time, using this label.

The geologic time scale was not entirely intentional, at least at its start. In the early 1800s, geologists began to create maps and descriptions showing where different types of rocks occurred ...

It’s one of three newly designated ages divvying up the Holocene Epoch, a geologic time period kicked off 11,700 years ago by the end of the Ice Age. First came a warming period, now dubbed the ...