The Early Cretaceous period lasted from about 145 to 100 million years ago and is known for significant geological and biological changes. During this time, the continents continued to drift apart, leading to the formation of new ocean basins. The climate was generally warm, which supported diverse ecosystems, including lush forests and shallow seas. Dinosaurs thrived during the Early Cretaceous, with many well-known species like Tyrannosaurus rex and Brachiosaurus emerging. This period also saw the first appearance of flowering plants, which began to diversify and spread. The Early Cretaceous set the stage for further evolutionary developments in the later Cretaceous period.