The Eocene Epoch lasted from about 56 to 34 million years ago and is part of the Paleogene Period. It is characterized by a warm climate, which allowed for the expansion of forests and diverse ecosystems. During this time, mammals began to diversify significantly, leading to the emergence of many modern groups, including early primates and whales. The Eocene also saw the development of the first true horses and bats. The continents were moving closer to their current positions, influencing ocean currents and climate patterns. This epoch played a crucial role in shaping the Earth's biological and geological history.