J Alexandra Sloan helps you plan a weekend or day trip to the Austin area in Texas, where you can get a glimpse of Central Texas geology, one of the premier karst regions in North America. ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­    ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏  ͏ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­  
View in browser
AAPG_Logo_Blue_2025
Geo-Lifestyle-logo

Thursday, 4 June, 2026 / Edition 112

Summer is in full swing in the northern hemisphere, and that means kids are out of school, temperatures are on the upswing, and pools are open! If natural water features are your jam, read on to find some great spots in and around Austin, Texas.

 

Barton Springs and Hamilton Pool offer an incredible combination of geology, outdoor recreation, and natural beauty. Whether you’re a geologist, an avid hiker or trail runner, or simply someone looking for some natural swimming holes, this area showcases fascinating groundwater systems and karst landscapes.

Ali-Sloan-Signature

 

J. Alexandra Sloan

 

Founder and principal geologist

4J Resources

The Geology of Barton Springs and Hamilton Pool

BartonSprings_WirestockCreators

Barton springs; Wirestock Creators/Shutterstock.com

Geologically speaking, Barton Springs and Hamilton Pool tell two very different stories. Together, they provide a glimpse into the geologic history of Central Texas and demonstrate why the Texas Hill Country is considered one of the premier karst regions in North America.

 

Barton Springs' geology: Barton Springs sits within its eponymous segment of the Edwards Aquifer, a highly productive karst aquifer associated with the Balcones Fault Zone.

    • The aquifer is composed primarily of Lower Cretaceous limestones.
    • Over time, faulting, fracturing, and dissolution enlarged pathways within the limestone, creating one of the most important groundwater systems in Texas. This groundwater feeds the springs.
    • Water emerging from the spring complex maintains a relatively constant temperature throughout the year, making Barton Springs Pool one of Austin’s most popular destinations.

Go deeper: Learn more about the geology of Barton Springs here.

 

Hamilton Pool geology: Hamilton Pool formed when the roof of an underground cave collapsed, leaving behind the spectacular grotto visible today. The remaining limestone overhang represents part of the original cave ceiling, a classic example of karst collapse.

    • The limestones exposed around Hamilton Pool were also deposited during the Cretaceous Period.
    • Groundwater emerging from springs within the Trinity Aquifer System helps sustain Hamilton Creek and the pool.
    • Ongoing studies continue to improve our understanding of how water moves through this portion of the Hill Country and how local fault systems influence spring flow.

Go deeper: Learn more about Hamilton pool's geology and hydrogeology here.

Sponsored

Molly Turko ad 01-26

Pockets Full of Rocks? We’ve Got the Swag to Match!

 

Designs for those who know a GOOD ROCK when they see one. Shop graphic tees, hoodies, kids' gear, hats, magnets, and more. Fresh designs are added monthly at GeoSwag.shop

SHOP NOW

Trip Tips: How to Visit

HamiltonPool_CLDR Photography

The Swimming Hole at Hamilton Pool Preserve; CDLR Photography/Shutterstock.com

Barton Springs and Hamilton Pool are only about 15 miles apart, so it is easy to visit both during a weekend or even a day trip!

 

For those interested in seeing the geology of Barton Springs firsthand, the Barton Creek Greenbelt offers excellent exposures of Edwards Group limestones, fault-related features, and karst development. After a run/hike/bike, there is no better way to cool off than a swim at Barton Springs Pool.

 

Likewise, the short hike to Hamilton Pool offers outstanding opportunities to observe karst processes, limestone weathering, groundwater-surface water interaction, and cave-collapse geomorphology. For anyone interested in geology, Hamilton Pool is one of the best outdoor classrooms in Central Texas.

 

Here are some fun places to visit while you are on your swimming hole adventure.

 

Where to stay:

 

 If you want to avoid the hustle and bustle of Austin, opt to lodge in Dripping Springs, a more rural town about an hour outside the city.

  • Camp Lucy: It sounds like a campground, but it is actually a luxury wellness resort and event venue. Their rooms, suites, and cottages provide relaxation and seclusion with any amenity you could need. 

Slightly west of Austin, you can get a great aerial view of the region by literally sleeping in the trees.

  •  Cypress Valley Treehouses –Spicewood: These treehouses blend fun and luxury, the perfect vantage point for geologists with whimsy. 

Prefer to embrace all that the city of Austin has to offer? 

  • The Carpenter Hotel has all the Austin vibes and is located just a five-minute drive away from Barton Springs. Or a very hot, and likely humid, 20-minute walk. You can choose 😉

Where to eat: TLDR, you're in Austin, the amazing food choices are endless. But a few recommendations... 

  • For a memorable breakfast fusion: Elizabeth Street Cafe blends French and Vietnamese cuisine. Never tried Hoisin sauce or Vietnamese coffee? You need this stop.
  • For craft beer and a family-friendly dinner: If you have littles who would love to watch and play with goats, Jester King Brewery is a good place to dine. You can sample some of the region's craft beer and snack on pizza.
  • To try Texas barbecue: When in Texas... brisket is king. Created by the same family that launched the legendary Lockhart Smokehouse, Terry Black's gives an approachable taste of the state's famous brisket, and its jalapeno cheddar sausages are worth a try, too.
  • To lift your spirits: See the pun I just made there? Treaty Oak Distilling is the fourth distillery ever established in Texas and home to award-winning bourbon.
  • And you must drink coffee... The city has been named among the top in the nation for its coffee, so your cup of Joe is bound to be delicious. I'd sample a new coffee shop every morning if I were you! 

Donate to AAPG

Want to help AAPG grow?

Consider supporting AAPG's free resources, like this one, by donating today.

AAPG thanks our advertisers for their support. Sponsorship has no influence on editorial content. Advertise with us.

 

Was this email forwarded to you? Sign up now.

 

You received this email because you signed up for newsletters from AAPG.
To stop receiving this newsletter, unsubscribe or manage your email preferences.

 

AAPG

 1444 S. Boulder Ave., Tulsa, Oklahoma 74119, USA

(918) 584-2555 | 1 (800) 364-2274 (US and Canada)

www.aapg.org

 

Facebook
LinkedIn
X
Instagram
YouTube