Texas Cave Reveals Ice Age Animals Lost to Science

Scientists crawling through a little-explored Texas cave just stumbled on an entire ice age ecosystem that's completely new to science.

Paleontologist John Moretti and caver John Young were exploring Bender's Cave near San Antonio in 2023 when they started finding fossils everywhere. The pair filled bags tied to their waists as they waded through the underground stream, picking up ancient bones lying in the mud.

Over six trips between 2023 and 2024, they discovered fossils from 21 different areas in the cave. Among the finds were giant sloth claws, mammoth teeth, and bones from ancient camel relatives that once roamed Texas.

But two discoveries really stood out: a pampathere, which looked like an armadillo the size of a lion, and bones from a giant tortoise. These ice age animals had never been found in central Texas before.

For more than a century, scientists thought they understood what ice age Texas looked like: dry grasslands filled with grazing animals. The tortoise and pampathere didn't fit that picture at all, since they preferred warmer, wetter conditions.

Moretti believes the animals lived during a warmer period roughly 100,000 years ago when temperatures rose between ice ages. Their remains likely washed into the cave through sinkholes during floods and settled on the streambed, preserving them for millennia.

The team faces a unique challenge in dating the fossils. The cave's mineral-rich water eroded the proteins scientists normally use for testing and contaminated the bones with carbon and other minerals.

Now they're trying a different approach: dating the calcite crusts that formed on the bones after they entered the cave. While this won't give exact ages, it will establish a minimum age for when the animals died.

Why This Inspires

This discovery reminds us that our planet still holds secrets waiting to be uncovered. A cave that had been largely ignored by scientists for decades contained evidence of an entire warm period missing from Texas' fossil record.

The find also shows how collaboration between experts and passionate amateurs can lead to breakthroughs. Young, the caver who knew the underground landscape, partnered with Moretti, who understood what those muddy bones could reveal about our past.

As Moretti put it: "We still don't know everything about the natural world. There's still a lot to discover out there."