You will notice behind me the scallopings on the roof, they are a cave-formed feature of the variety known as "speleogens". A speleogen is the inverse of a speleothem – a cave deposit; they are wear features that result from the abraision and solution of running water. Scallops are spoon-shaped scoops that vary in size depending upon the turbulence of the water. A caver can decipher the direction of water flow in a tunnel by observing the most precipitous side of the scallop's bowl. These features grow with their steepest edge up against the direction of water flow.
One of the distinctive features in this particular system is that the main passage holds the "dry time" water flow and it is intersected at various intervals by sizeable joints. These joints are high and narrow and I am told that they serve as a winter hibernaculum of several hundred bats.
Another visitor to the cave reported that he had followed down one of the joints to its near terminus in a sandbank and had felt a distinctive breeze there. It was, he said, the only such place that the air was venting in and so by the knowledge of other nearby passages, assumed that it might be a cave dig. One can speculate that an open tunnel there would make the long-suspected, yet never proven connection to other local passages.
I was met by a most eerie sight as I first entered into the main passage. Above the stream a low river of mist flowed from around a corner. It was only about 18 inches thick but perfectly contained as a gauzy ribbon. It reminded me of the "Angel of Death" that had emerged from the "Ark of the Covenant" in one of the Indiana Jones movies. Our entry into the stream soon disrupted the air flow and the effect quickly disappeared.
In contrast to the joint-oriented side tunnels the main tunnel has formed in the bedding plane, that is, the horizontal separation between various dolostone stratas. As is typical of those type of tunnels they are low and wide, most often elliptical in shape. It is this type of tunnel in which I have been photographed.