...of some old rocks. I pulled into a scenic overlook in Oklahoma and found a sign placed by the local geological society and thought you might be interested. (Just ignore them gang symbols and bullet holes ) From Wikipedia: The Arbuckle Mountains are an ancient mountain range in south-central Oklahoma in the United States. The Arbuckles date back to 540-440 million years ago in the latest Precambrian and earliest Paleozoic era, and reach a height of 1,412 feet above sea level. Arbuckle Mountains - Wikipedia, the free encyclopedia If I'm reading the chart correctly, this is all West Spring Creek Limestone. Here is a link to the exact location and some more pics - Arbuckle Anticline - OK - Places of Geologic Significance on Waymarking.com . . . .