I live in a Karst area somewhere in VA. At the base of rocks on my land, in my forest, there are some openings, apparently made by untold centuries of water run off. I have found at least eight of them. The pictures below pretty much describe the scenes. The area in front of them seems to be just mud, in that a grounding rod is easily pounded in and hits no rocks. The shovel handle will go all the way into the opening, and it extends back further and deeper than I can see.
Clearly, there is a temptation to excavate one or two of the openings and see just what it is I own. I could just drag over the backhoe and start digging, but archaeological concerns make me pause. Is there a right way to do this? Does anyone have any web links to a good how-to webpage?
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[url=http://upload9.postimage.org/5878/photo_hosting.html][img]http://upload9.postimage.org/5878/deep.jpg[/img][/url]