Cenozoic Hall: The Hall of Fossil Mammals

Exciting things are happening at Carnegie Museum of Natural History! A fresh look and new signage are in the works for Cenozoic Hall and Bonehunters Quarry on the first floor of the museum. The spaces will be closed while staff makes updates. Check our Tumblr, Facebook, Twitter, and Instagram for updates on the project.


irish elk Cenozoic Hall presents fossils of animals that lived during the last 66 million years of Earth history, which is known as the Cenozoic Era, or Age of Mammals. Although mammals first evolved early in the Mesozoic Era (the Age of Dinosaurs), they diversified greatly during the Cenozoic, after the extinction of dinosaurs had dramatically modified the character of many of Earth’s habitats.

The most recent 2.6 million years of the Cenozoic is known as the Pleistocene Epoch, commonly called the Ice Age. During this interval enormous glaciers moved over large areas of the northern continents, changing climatic conditions and strongly impacting plant and animal evolution and distribution.

Exhibition Highlights

Cenozoic Hall Mammoth Cenozoic Hall documents some of the evolutionary history of mammals during the past 66 million years and emphasizes many of the strengths of Carnegie Museum of Natural History’s paleontological collection. Especially noteworthy are specimens collected from what is now Agate Fossil Beds National Monument in western Nebraska. Between 1900 and 1908, Carnegie Museum paleontologists made a large collection of approximately 20 million-year-old mammal fossils from this region. Specimens on view in Cenozoic Hall include exquisite skeletons of the bizarre, horse-like Moropus and the formidable warthog-like creature Dinohyus, an amazingly dense ‘bone bed’ composed mostly of remains of the ancient rhino Menoceras, and a grouping of three oreodonts (extinct hoofed mammals) that perished in a sandstorm and are preserved exactly as they died. Other exhibits illustrate anatomical changes through time, including those that occurred during the 55 million-year evolutionary history of the horse.

The Pleistocene area of Cenozoic Hall features several well-known Ice Age species, including a fossil skeleton of a Columbian mammoth from Milliken, Colorado, and skeletons of a saber-toothed cat, dire wolf, and giant ground sloth from the famous Rancho La Brea tar pits of California. Also on exhibit are skeletons of a moa (a giant flightless bird from New Zealand) and an Irish elk.