For those of you heading out tomorrow for the Vulcan Quarry trip; and there are a lot of folks coming-(thank you), a few more specifics in the directions: The physical address for your "Map-questing" : Vulcan Royal Stone Quarry 4060 Quarry Hill Lane Rockville, VA 23146 804.360.2014 The scale house is immediately after you enter-in the median area per se. You will see enough binocular adorned folks and cars to know where you are. Should be a "Gneiss" day. JulieK I'll have my cell phone (804.691.0570)