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Lyle: Thanks for the information. I'll take a while to meditate on what you've presented and will respond in due course. The more detailed and comprehensive descriptions we have, the better. If you've extracted any of the wedges and feathers or found any tools used or apparently loose (a metal detector would be a boon device), any additional remarks on them--in particular as regards wear or deformation--would be welcome. Another tacit concern we probably share aside from documentation of the site and material are preservation possibilities, which explains the nod to rescue archeology, especially if the site is newly emergent from a long spell underwater. I salute your interest. Regards, Edward Hennessey --- On Mon, 6/13/11, Lyle E. Browning <[log in to unmask]> wrote: > From: Lyle E. Browning <[log in to unmask]> > Subject: Re: Rock Holes: Addendum Question > To: [log in to unmask] > Date: Monday, June 13, 2011, 6:48 PM > On Jun 13, 2011, at 1:34 AM, Thaddeus > Kind wrote: > > > Lyle: > > > > Can you describe your "granite" in detail with > reference to > > comprising minerals, their element sizes and > distribution/arrangement? > According to the work of Thomas L. Watson (Mineral > Resources of Virginia, 1907:22), the granite in the Richmond > area is "feldspar-quartz-biotite rocks, which vary from fine > to medium granular in texture, and from ark to light gray in > color." This material has weathered to a rich golden tan > color in the river bed. He also says that the monumental > rock is a fine-grained dark blue-gray and that used for > roads is a coarse and lighter gray. Material from the > Richmond area quarries was used to construct the State, War > and Navy buildings in Washington, D.C. > > Lyle > > > > > > > You should > > be able to find systematic petrographic > classifications on > > the web with pictures. Certain marketing profiles on > commercial dimensional stone sites often provide valuable > physical coefficients which may generally predict what > actual tests on your specimens may later more precisely > aver. > > > > Selecting something from Google Images > > which corresponds to roughly to your rock of--or > directly > > to the named locality--might also be a winning > approach to abet > > analysis. > > > > Another trove for historical context, though likely to > prove a tough slog without indices, would be local newspaper > archives. > > > > Regards, > > > > Edward Hennessey >