Longhorn Cavern and Enchanted Rock

Today was Great! We drove from Galveston to Longhorn Cavern and were met there by Dr. Mathewson, from the first day. He was going to be our guide for our trip through Longhorn Cavern, remember his presentation from Monday. He showed us the different structures and possible explanations for them. I recorded his tour presentation, audio only, and I will load it up later.




After Longhorn Cavern, we traveled to Enchanted Rock and climbed to the top. Rick explained the intrusions due to fractures, exfoliation of the granite and discussed the batholith and lacolith. It was great fun going to the top. As for chemistry, some of the dark markings on the granite are due to manganese (II) oxide. First time I see it, used to manganese (IV) oxide.