The Devonian Period is a geological time frame that lasted from about 419 to 359 million years ago. It is often called the "Age of Fishes" because of the significant evolution and diversification of fish during this time. The period is marked by the appearance of early jawed fish and the first amphibians, which began to adapt to life on land. The Devonian is also known for its rich marine ecosystems, including coral reefs and various invertebrates. The climate was generally warm, and the continents were positioned differently than today, leading to the formation of extensive shallow seas. Major land plants, such as early trees and ferns, began to flourish, contributing to the development of terrestrial ecosystems.