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Greetings to all NIHSDA members! I'm so excited for you to see these wonderful Rock Art carvings done on our Jurassic Sand Scratch Boards at the 2015 NIHSDA meeting in Sacramento.   I want to thank everyone that took me up on my offer to 'sign' our unique visitor book. It was a 5" x 7" piece of Navajo Sandstone mounted to white cardboard that you had to carve into to make modern-day Petroglyphs. We make them from the sand that has weathered out of the 200 million year old Navajo Sandstone Formation (the geological name of the rock formation we...