14,000 years ago
Numerous details of the glacial landscape are among this mural’s highlights, many of them suggested to Matternes by University of Arizona glacial geologist Troy Péwé. As seen above, windblown dust, or loess, is carried aloft and eventually settles, often burying animal carcasses. Outwash from melting glaciers creates mud-filled, braided stream channels that drain into glacial lakes, while geometrically patterned ground forms in the upper portion of the permafrost as it thaws each summer and freezes in the following winter (right).
In the foreground, a woolly mammoth calf is harassed in a coordinated attack by a pair of scimitar-toothed cats (Homotherium serum), while the mother mammoth turns to intervene. Farther back, a mastodon (now known to have lived in earlier times) is distinguished from the mammoth by its wider body and flatter back.
Up into historical times, great herds of bison were characteristic of North American landscapes. Subtle differences between the ice-age species and the one we know today are reflected in Matternes’s painstaking studies of the animal’s skeleton, musculature, and external appearance (opposite). In the distance at right, some of the earliest human immigrants to the Americas hunt a giant ground sloth (Megalonyx).
Here the contrast between the mural’s different species of musk oxen can be seen. The helmeted musk ox (Bootherium, two left images below) had a less bulky body, flatter back, and higher-placed horns than its humpbacked, stockier living relative (Ovibos moschatus, bottom right). A third species, Symbos cavifrons (upper right), is now thought to represent females of Bootherium.
Matternes grants each animal in the mural individuality by paying detailed attention to its position, behavior, and posture. Here a small female saiga antelope heads toward a larger horned male and away from danger; a preliminary sketch (opposite, lower left) captures its essence in economical lines. The rightmost American lion in the mural background began as a full skeletal reconstruction (opposite, lower right), which underpinned a lifelike restoration (opposite, top). Matternes then subtly altered the image in the final mural.
Matternes invested tremendous attention into the details of each species he reconstructed. He developed the mural’s short-faced bear (Arctodus simus) first as an articulated skeleton (right), individually drawing and measuring its bones from a specimen in the Field Museum. He then layered on the animal’s deep and superficial musculature (below left) and finally clothed it in finely textured fur (below right). These drawings include corrections that the artist made based on Finnish paleontologist Bjorn Kurtén’s (then lecturing at Harvard) suggestions that the original sketch had an extra lumbar vertebra. Opposite: Matternes often solicited outside advice from scientists such as Kurtén, in this case for his skeletal reconstruction of the cat Homotherium (then called Dinobastis).
Matternes provided even the smallest animals with fine detail and vivid behavior. A lemming gnaws at the bones of a dead reindeer (below) while a ground squirrel runs nearby (top). A black-footed ferret stands alertly (opposite, top left), while a badger guards its burrow near a patch of creeping Arctic willow (opposite, top right). The artist based the Arctic hare (opposite, lower left), seen bounding away from a hungry fox, in part on an exquisite ice-age mummy at the AMNH (opposite, lower right).
Mural development involved several stages, one of which was a full sketch layout (below) in which the artist brought together animals, plants, and landscape so that he could evaluate the overall mural. He modified it in subsequent versions (opposite) before transferring it to the wall canvas.