Full Title: Highlights of the Hill Country: A Trip Through the Llano Uplift
Led by: Zachariah Fleming, Michael T. Read, Liane Stevens
Date: Thu. 23 Oct. 2025
Time: 7 a.m.-8 p.m.
CEUs: 0.8
This one-day field trip will explore highlights of central Texas and Hill Country geology in and around the Llano uplift. The Llano uplift contains complexly deformed Grenville-aged metavolcanic and metasedimentary rocks that are intruded by syn- and post- tectonic granites. This Mesoproterozoic rock is overlain by Cambrian and younger sedimentary rocks along the flanks of the uplift. Join the trip and we will explore the igneous and metamorphic rocks of Enchanted Rock, a spectacular example of an exfoliation dome, and an excellent location to explore the rocks formed by the continent- continent collision during and following the Grenville orogeny. We will visit an outcrop of the uniquely Texan rock llanite, as well as beautiful exposures of the Cambrian Hickory Sandstone, which nonconformably overlies crystalline basement. Outcrops on this trip range are all accessible either along the roadside or via a short hike. An optional longer hike at Enchanted rock will be offered. Cost includes transportation, lunch, snacks and water. We will stop for dinner in town before heading back to San Antonio.
By purchasing this item, you are buying a seat on an in-person geological field trip.
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Learn more about this and other GSA Connects 2025 events.
For additional information, please contact Rebecca Taormina, rtaormina@geosociety.org, GSA Field Trip and Short Program Coordinator.
Product Code: FT25CN426
Product Category: FTRIP