Canyon Lake Gorge

Canyon Lake Gorge is a limestone gorge in Texas, which is around 1 mile long, hundreds of yards wide, and up to 50 feet or more deep, which was exposed in 2002 when extensive flooding of the Guadalupe River led to a huge amount of water going over the spillway from Canyon Lake reservoir and removing the sediment from the gorge. The gorge provides a valuable exposure of rock strata as old as 6000 years showing fossils and a set of dinosaur tracks, and forms a new ecosystem for wildlife with carp and other creatures in a series of pools fed by springs and waterfalls.The Gorge Preservation Society formed as a local citizen's group to develop long-term plans for the Gorge in partnership with the Guadalupe-Blanco River Authority and the U.S.

Source: Wikipedia