E44: Mammoths in Mesa with Paleontologist Dr. Bob

If you can picture Mesa 15,000 years ago, it would look nothing like it does today. Instead of dry desert landscapes, the region was cooler, wetter and full of life. Rivers like the Salt and Gila flowed year-round, supporting ecosystems where mammoths, camels, tortoises and ancient pronghorn once thrived. In fact, the desert itself did not fully emerge until about 8,000 years ago, making it a relatively recent development in Earth’s history.


For Dr. Bob, the journey into paleontology started early. At just four years old, he decided this was the path for him and never looked back. Today, while his role includes leading teams and overseeing museum operations, his passion remains rooted in discovery. The excitement of uncovering something that has not been seen in millions of years is what continues to fuel his work.


One of the most fascinating discoveries tied to Mesa is the Mesa Mammoth, a juvenile specimen now housed at the museum. While it may not be a complete skeleton, it offers valuable insight into prehistoric life, even down to how its teeth developed. Findings such as these help scientists piece together a clearer picture of the animals that once called this region home.


But fossil discovery is not as simple as digging in the ground. The process begins with identifying land ownership, since fossils legally belong to the property owner. From there, researchers work closely with landowners and agencies to ensure proper excavation and preservation. It is a process that blends science, collaboration and careful attention to detail.


Then comes the question many people wonder about: how fossils form. Not every bone becomes a fossil. Some remain as dry bone for thousands of years, while others transform as minerals to replace organic material over time. Environmental factors like water, sediment and timing all play a role in what is ultimately preserved. ultimately preserved.