Support Us Button Widget

Ancient fossils found in the Austin area

Austin is home to some ancient history, including gigantic aquatic lizards, prehistoric humans, and dinosaur tracks uncovered by flooding.

ATX_OnionCreekMosasaur

The Onion Creek Mosasaur rivaled the size of the terrifying T. Rex. | Photo by Larry D. Moore via OpenVerse

Larry D. Moore

Though Austin may be but 188 years old, there is tons of history to be found here.

We’ve already told you all about objects in local museums that are older than the Capital City, but we want to go deeper with fossils that were found in town, with some dating back millions of years.

The Leanderthal Lady

Discovered in 1982 at a construction site in Leander, “The Leanderthal Lady” (aka “LeAnne”) is a prehistoric female skeleton discovered by Texas Highway Department archeologists. Carbon testing revealed that she was about 30 years old, measured 5' 3", lived some 10,000-13,000 years ago, and was buried with great care.

Onion Creek Mosasaur

An enormous, 30-to-50-ft water lizard called a Mosasaur once roamed the waters (up to 600 ft deep) of Central Texas in the late Cretaceous period. Its skeleton, discovered at Onion Creek by UT geology students in 1934, had sharp teeth and a jaw that could open nearly three feet. You can see it for yourself displayed in the Texas Science & Natural History Museum.

Dinosaur tracks

As recently as 2025, dinosaur tracks were discovered in the Big Sandy Creek area after the July floods. UT Paleontologists believe the three-toed footprints found in limestone date back 115 million years ago and were likely made by an Acrocanthosaurus.

You could make the next big discovery. Find some fossils on your own at Shoal Creek, Enchanted Rock, or a hiking trail.

More from ATXtoday
The Mermaid Capital of Texas, home to Texas State University, and riverside town is a great place to take a day trip — we’ve got all the spots to hit when you visit.
This list of volunteer opportunities in Austin, TX includes everything from building homes for people in need to fostering shelter animals.
The ABC Kite Fest — originally called the Kite Tournament — has been an Austin staple for almost a century, providing free fun for kids and adults alike.
The home to some of Austin’s most iconic venues, the district has generated $2.3 billion in impact in five years.
We’ve got some jokers in the Capital City, and these pranks from local businesses almost had us fooled.
Who says the kids should have all the fun? Here are four Easter egg hunts where everybunny 21 and up can relive the nostalgia.
Bookmark this guide for a curated list of events taking place each month that we’re most looking forward to.
The momentous 40th anniversary of the festival brought hundreds of celebrities, dozens of premieres, thousands of steps, and some key messages to ATX in 2026.
Help us create a growing guide to small businesses by submitting your favorite local makers, restaurants, and professionals, and sharing this page with a friend.
Experience jousting, live performances, artisan markets, and feasts every weekend through Sunday, April 19.