Geologic Setting
Swecker Cave is formed mostly in the basal Denmar member of the Greenbrier limestone. Numerous small springs northwest of the cave entrance issue from the Taggard shales and flow 1,000 feet southeast. At this point the stream makes an abrupt turn to the southwest and is swallowed in the impressive Swecker sink. Inside the cave the culprit for this abrupt change in direction is seen as an obvious fault forming the balcony drop. Slickensides can be seen throughout the ceiling of the borehole. Fault control is indeed obvious when viewing the cave system on end. It is then seen how Amphipod Alley, the entrance balcony, Swecker Upper Decker, and the ceiling of the trunk passage are aligned along this fault. The stream passage is relatively new to the cave, representing the usual downcutting through the limestone while abandoning the upper level. The stream resurges on the surface 2,000 feet southwest from the entrance among talus below an impressive limestone headwall.

Biology/Paleontology
Swecker Cave appears to be the summer home to several eastern pipistrelles. The tight entrance, overall low humidity of the cave, and relatively warm cave temperatures will make it an unattractive bat hibernation site. Crickets and amphipods were noted.