Friday fold: An odd duck
A USGS colleague shows Callan a bizarre fold outcrop in the Conococheague limestone of the Boyce quadrangle, Virginia.
Friday Fold
Friday fold: Martin’s metamorphics
A guest “Friday fold” from South Africa: folded gneisses, flavored with other treats of a geological nature.
Friday fold: clear evidence of the work of the Intelligent Folder
Yesterday’s post showcasing my conversational critique of Intelligent Design got a lot of attention, including tweet love from @NCSE and @BadAstronomer, and a blog post at Pharyngula. So, at the risk of overkill, I decided to have a little fun with the Friday fold… Check out this fold that I found in float of Purcell … Read more
Friday fold: LIDAR view of the Weverton Formation along the Blue Ridge front
Dan Doctor of the US Geological Survey contributed this week’s Friday fold. It’s a lovely view of the asymmetric folds in the Cambrian-aged Weverton Formation (part of the Chilhowee Group, a Sauk-Sea passive margin transgressive sequence), exposed on the western flank of the western limb of the Blue Ridge Anticlinorium. It’s a LIDAR image, and … Read more
Friday fold: Mosaic Canyon Monster
While out in Death Valley with my Field Studies students last March, we encountered an extraordinary fold in Mosaic Canyon. Check this thing out: The rock is the Noonday Dolostone (“Noonday Dolomite” in mineralogically biased argot). It may be hard to make out what’s what there… So let me assist with a little annotation, tracing … Read more
Friday fold: Gansbaai
A small mountain inland of Gansbaai, South Africa (where one goes to cage-dive with great white sharks) shows some of the folding characteristic of the Cape Fold Belt. Let’s zoom in… A few bedding traces annotated, to ease your armchair fold-viewing experience. I think this is my final photo from South Africa… Wow. Only took … Read more
Friday fold: “Chasing Ice”
Callan watches the new documentary “Chasing Ice” about James Balog’s Extreme Ice Survey project, and spots a lovely Z-fold during the largest glacial calving event ever recorded.
Friday fold: Hoerikwaggo Trail 5
We wrap up our week-long odyssey along South Africa’s Hoerikwaggo Trail with a look at something we look at every Friday: folds! In this case, we’ll be examining folds in the bedding layers of the Table Mountain Sandstone.
Friday fold: Up on Opequon Creek
I got a call last month from Rebekah Wiedower, a landowner up in Frederick & Clarke counties (her family’s property includes pieces of both), inviting me to come up and look at some anticlines and synclines that Dan Doctor (USGS) had identified on the bank of Opequon Creek. I was glad to do it, though … Read more
Friday fold: Bighorn monocline
Happy Friday! The last one of 2012, in fact! To celebrate, check out this monocline on the western flank of the Bighorn Range in the Rockies of Wyoming: Click to enlarge Annotated. Check out those fine hogbacks! Previously, we also saw this same structure in this GigaPan: [gigapan id=”80440″] link