Glen Rose, Hensel Sand, Cow Creek, Hamlet Sand, and Sycamore Sand. These levels can shift which caused the collapsed grotto that is located in the preserve. Geologists can find out about the history of the Texas landscape by studying ancient rocks, like limestone. Limestone is one of the most common type of rock in the Westcave area of Texas. The hills of the Hill Country are mainly limestone.
Limestone is a sedimentary rock that is made by the organic and mineral deposits of ancient oceans.
It is sometimes very brittle, but it can be very strong. Some of the largest limestone deposits are in the center of Texas, where vast seas used to exist and where Westcave is located today. Another common rock in the hill country is granite. It is an igneous rock. Igneous rocks were formed by volcanoes.