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 • Image Gallery
Mass extinction at the end of the Mesozoic Era had devastated life on Earth. All dinosaurs except birds had disappeared. The Cenozoic Era—the age of mammals—had begun.
During the first part of the Cenozoic Era (called the Tertiary Period) tropical forests stretched from pole to pole. These warm habitats were home to a diversity of fishes, birds, insects, plants, and mammals, which began to develop new features and reach new sizes.
Later, as temperatures fell, grasslands grew and transformed the landscape. As the planet changed, so did mammals, with some going extinct and new ones always evolving.
Scientists learn about Tertiary plants and animals through a number of specimens and fossils.
Continue to Fossil Lake Specimens. >>
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