Silurian

The Silurian

The Silurian was a special time in Earth's history. It lasted for 23.5 million years, from 443.1 million years ago to 419.62 million years ago. It was the third and shortest time of the Paleozoic Era, part of the bigger Phanerozoic Eon. Scientists study layers of rock to learn about this amazing time.

One big change during the Silurian was the first time plants grew on land. These early vascular plants were different from simpler plants and changed life on Earth forever. Fungi and tiny creatures like spiders and millipedes also began living on land.

Many new kinds of fish appeared in the oceans during the Silurian. These included types like placoderms, acanthodians, and bony fish. Some older kinds of fish, like those without jaws, became less common.

The Silurian got its name from a Celtic tribe in Wales called the Silures. A scientist named Roderick Murchison studied rocks in Wales and named this time after them. His friend Adam Sedgwick helped him with the idea. Together, they helped make the modern geological time scale.

During the Silurian, a huge land called Gondwana sat near the equator. Big oceans covered most of the north. Three land areas—Avalonia, Baltica, and Laurentia—began moving closer to the equator, forming a new land called Euramerica.

The Silurian was when life on land began to grow. Tiny plants and moss-like plants started to appear near lakes and streams. This was the start of a big change for Earth. In the oceans, many different sea creatures lived, including corals and fish with bony scales. It was an exciting time for life on our planet!