Riphean age

The Riphean is a special time in Earth's history, lasting from 1,600 to 600 million years ago. It is part of what scientists call the geologic timescale, which helps us understand how old Earth is and what happened during different times long ago. This name is mostly used in Russia and parts of Finland, but it used to be used around the world more often.

During the Riphean, many interesting things happened on our planet. One big change was the growth in different kinds of tiny, ancient structures called stromatolites. These were built by very small organisms, and their increase may be linked to the first appearance of a special kind of cell called eukaryotes.

The word "Riphean" comes from an old name for a mountain range called the "Riphean Mountains", which some people think might be the same as the Ural Mountains today. Scientists have split the Riphean time into three smaller parts: the Early Riphean (1600–1400 million years ago), the Middle Riphean (1400–1000 million years ago), and the Late Riphean (1000–600 million years ago).