Scientists say an excavation site in western Colorado is revealing an entire Ice Age ecosystem.

Crews from the Denver Museum of Nature and Science said Friday that the remains of two more kinds of animals have been discovered near the resort town of Snowmass Village _ an upper arm bone from a giant ground sloth and a small deer-like animal.

Partial remains of five mastodons, three Ice Age bison and a juvenile Columbian mammoth as well as plant matter and insects have also been found. Crews haven't found any human artifacts.

The museum is bringing in more experts to help, including University of Michigan paleontologist Daniel Fisher. He's the guest curator for a traveling exhibit on mammoths and mastodons, which opened at The Field Museum in Chicago.