Riphean age

The Riphean is a special time in Earth's history. It lasted from 1,600 to 600 million years ago. It is part of what scientists call the geologic timescale. This helps us understand how old Earth is and what happened long ago. This name is mostly used in Russia and parts of Finland.

During the Riphean, many interesting things happened on our planet. One big change was the growth of tiny, ancient structures called stromatolites. These were built by very small organisms.

The word "Riphean" comes from an old name for a mountain range called the "Riphean Mountains". Some people think this might be the same as the Ural Mountains today. Scientists 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).