Landowner permission is required to access the site.  "The window is located in the base of a large sinkhole in the Lower Ordovician Rockdale Run Formation.  The window consists of a very short reach of a small cave stream that emerges from the southeastern side of the sink and flows back underground to the north-northwest.  The water then re-emerges at an underwater spring in the channel to Opequon Creek ~800 ft (244 m) to the north-northeast."  Stop 2-1 Doctor et al.