Last week, I stayed at my father's house in Arlington, Virginia to look after my little sister while my dad and stepmother were out of town. It was a hectic week, but I was able to take some time on Saturday morning and return to Windy Run, which I hiked last time a year ago. Every time I go down there, I see something new. Here was a nice little outcrop I found this time: a large boulder showing our foliated local metagraywacke, with a boudinaged granite dike going through it. Interestingly (to me, anyhow), the granite dike has clearly-defined potassium-feldspar-rich and quartz-rich areas. The dike was likely emplaced in the late Ordovician, during the Taconian Orogeny. After the dike cooled and solidified, it was broken into chunks (boudins) and those boudins were separated, with ductile metagraywacke flowing into the gaps between them. Geologists call this "boudinage" from the French for sausage. They kind of look like a string of sausage links... The perfect thing for a weekend morning at breakfast time!