Week 3 of the Master Naturalist course was just spectacular. The class was on Geology and we spent the day driving and hiking around different geological places in Austin.
Did you know that several million years ago Austin was host to a couple of volcanoes? You can still see the remnants of some lava in a small spot in the Barton springs park which is where a strong spring comes out into a refreshing pool used by many to cool off in summer. The reason for the diverse landscape here is because of a fault line called the Balcones fault. It makes east Austin and west Austin so very different. No exciting animals such as snakes in this class, but we did get to see some cool fossils and natural gypsum which looks like glass in the ground.
The above picture is of a very steep mountain bike trail. Looks more like a luge trail for the winter Olympics to me!! The reason for visiting this site is because this is the place where a huge amount of fossils are exposed. Little fossil Oysters called Devil’s Toenails (Gryphaea) which come from the Jurassic Period and are 190 million years old. They used to inhabit this area when Austin was a swampy marine lagoon. Amazing how things change.
Austin also had a mountain range which has eroded away called the Ouachita. This was connected to the Appalachians if you can believe that!!
Some of our rivers are flowing again as you can see in picture above. This was taken at the Wild Basin wildlife preserve west of Austin.