For a long time after I first visited caves in San Saba County in the 1960s I assumed that the source of the high levels of CO2 were due to decomposition of organic materials that originated on the surface. At some point (years ago) after radon became a hot topic I started associating radon with CO2 out gassing and more recently wondering if any radon studies have been done at CBSP. So I asked my caver friend and geologist Steve Hall of Virginia about those relationships. He is a radon specialist. He said that the source of out gassing CO2 is often igneous rocks which are also a radon source. I started to wonder what the rock sequence was in the Gorman Falls area. How thick is the limestone/dolomite? What formations lay between the top layer and the granite below? Could that be a source for the CO2? Should cavers there take any special precautions regarding radon? I tried the internet without getting much satisfaction so am wondering if anybody has information on any of that handy. It would make an interesting discussion. --Ediger
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