16 September 2011

Friday fold: Pinelog Formation

Posted by Callan Bentley

Reader Jacob Langseth sent in this image of a lovely fold that he recently saw in the Blue Ridge province of Georgia. It’s located in an old CCC rock quarry, off of the Pine Log Creek Trail system, in Bartow County.

You can click on that first image to make it bigger and see a bit more context. Nice differential weathering, eh?

…Or you can just keep scrolling down, to see the (obligatory?) annotated version that I whipped up:

I consulted with the reigning queen of Georgia geology, Pamela Gore of Georgia Perimeter College, and she was able to shed a little more light on this feature… She’s just finished writing a new book, The Roadside Geology of Georgia, with co-author Bill Witherspoon. Both of them were kind enough to spend a bit of time identifying Jacob’s fold. These rocks are identified as “pp3” (phyllite and quartzite) on the extant state map, as Pinelog Formation on Tull GGS 2007, and as Wilhite Formation undivided on Thigpen & Hatcher’s 2009 Western Blue Ridge GSA Map and Chart MCH097 compilation. Thanks to Pamela and Bill for sharing their expertise.

And: Thanks for sharing this, Jacob! I welcome other reader contributions for the “Friday fold” series. Just shoot me an e-mail. Include any relevant details that you’re aware of.