At the Rocky Mountain Section meeting of the Geological Society of America this week, there were several displays of interesting cores. I’m not sure where this one came from, but it had a fold in it, and since no one else had volunteered a Friday fold for this week, I took a photo:
It’s standard core diameter; I’d guess that’s about 2 inches.
Given that I’m headed out on an accretionary tectonics field trip today; I hope to have more impressive folds for you next Friday. Or: you could always send me a photo or two… hint, hint.