Click to enlarge
I’m writing this on the Amtrak train from New York back to Charlottesville, traveling (again) under orange-hazy skies due to Canadian wildfire smoke. I took my son to Manhattan for a concert, and we stopped off en route for an overnight in Philadelphia, visiting a former student of mine who’s now an assistant professor of geology at Rowan University in New Jersey. While walking around Philly, I saw an old church that had been built from blocks of locally-quarried Wissahickon Formation schist. This particular block shows some nice small-scale folds in both the foliation (subtle, at right) and a trio of quartz veins (more obvious, center).
Also, in another block of the same formation in the same church wall, I saw this lovely little garnet porphyroblast bearing pressure-shadow “beards” of quartz that have grown out along the plane of foliation:
Hi Callan, just want to say thank you for your very informative blog, I read it and look forward to it, I’m a retired geologist and will get busy and send some great folds in the Overthrust belt of Montana where I live. Thanks again, Chuck
Super! Can’t wait to see them!