Excellent. Thank you very much. As I mentioned in a previous post, we have a "negative" formation here of "cannonball" limestone. > > From: "Anthony Farr" <[EMAIL PROTECTED]> > Date: 2006/10/27 Fri PM 02:25:58 GMT > To: "'Pentax-Discuss Mail List'" <pdml@pdml.net> > Subject: RE: TGPA > > It's a formation called tafoni. > > I'm certain of it because I once spent several days scouring Sydney's > coastline for examples of tafoni to illustrate a magazine article. > > Tafoni is created when rock undergoes repeated cycles of wetting and drying. > Chemical impurities in the rock accrete into the areas defined by the raised > ridges, which become hardened. The areas from which the chemical impurities > are leached become soft and easily erodable. Beginning as mere dimples, the > eroded pockets can eventually develop into caves. > > Regards, > Anthony Farr > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > mike > > wilson > > Sent: Wednesday, 25 October 2006 8:09 PM > > To: pdml@pdml.net > > Subject: TGPA > > > > Anyone know what this picture is of? > > > > http://www.tgpa.ca/index_photos/new_sample24.jpg > > > > > > ----------------------------------------- > > Email sent from www.ntlworld.com > > Virus-checked using McAfee(R) Software > > Visit www.ntlworld.com/security for more information > > > > > > -- > > PDML Pentax-Discuss Mail List > > PDML@pdml.net > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net >
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