Every day, people from all over the world visit White Sands National Park and leave traces of their adventures. The white dunes of the Tularosa Basin are just a recent occurrence on the geological timeline. At White Sands, we find many remarkable fossilized footprints scattered across Lake Otero. While these footprints are ancient, scientists are still uncovering new evidence of past life.
For 80 years, only a small collection of fossilized footprints were known to exist at White Sands. However, in 2006, a group of scientists noticed dark spots dotting the expanse of the lakebed that appeared to be footprints. Their curiosities lead them to dig up these dark spots in 2009. This led to the discovery of both Harlan’s ground sloth and human footprints. During the 2010s, footprints of a dire wolf were discovered. These footprints were located next to ancient seeds. Scientists dated these seeds to more than 18,000 years ago.
In 2018, researchers discovered what they believe to be footprints of a female. They tell a story that may seem familiar today; her footprints show her walking for almost a mile, with a toddler’s footprints occasionally showing up beside hers. Evidence suggests that she carried the child, shifting them from side to side and occasionally setting the child down as they walked. The footprints broadened and slipped in the mud as a result of the additional weight she was carrying.
Based on stature and walking speed, it appears that most of the footprints in this study come from teenagers and children. As reported in the journal Science, “One hypothesis for this is the division of labor, in which adults are involved in skilled tasks whereas 'fetching and carrying' are delegated to teenagers. Children accompany the teenagers, and collectively they leave a higher number footprints that are preferentially recorded in the fossil record. This pattern is common to all excavated surfaces.” (Bennett, 2021)
Footprints across White Sands have been found coexisting and interacting with extinct ice age animals. One set of footprints shows what appears to be humans stalking a giant sloth. This is demonstrated by human footprints being found inside the footprints of the sloth as they were tracked. Unfortunately for our hunter, there is no evidence that this was a fruitful hunt.
Although the reason for the disappearance of the great animals of the ice age is still debated among scientists. The ice age ended because of changes in the earth’s climate. Environments once rich in lush green life began to disappear. The fossilized footprints of White Sands are probably the most important resources in the Americas to understand the interaction of humans and extinct animals from the ice age.
These fossilized footprints, among other natural and cultural features found in the dunefield, further propelled the movement to re-designate White Sands National Monument into White Sands National Park. As a massive landscape filled with history, White Sands continually proves to be more than just a sandbox.
Dig Deeper: What animals made these tracks?
MEDIA - B-roll footage of the fossilized footprints is available here.