Happy Friday! Here’s a view of the folded contact between the (older, lower) New Market Formation, and the (younger, upper) Lincolnshire Formation, as exposed in Staunton, Virginia: The contact has been folded, pretty intensely: The New Market Formation is massive, light-colored, and exhibits fenestral texture here. The Lincolnshire is darker, more thinly-bedded, and is chock … Read more
Last weekend, after we checked Lily in for her race, I spotted some boulders near the check-in site. The next morning, once the race had started but before we could cheer her on, my field assistant and I went back to the boulders to check them out. My field assistant’s planners had forgotten to pack … Read more
The Friday fold combines a moment of insight on a field trip in the Archean Superior Province and a new paper published this month in the journal GEOLOGY.
More folds from the charismatic Noonday Dolostone in Mosaic Canyon, Death Valley National Park, California: Annotated: Happy Friday!
For the Friday fold today, let’s return to the warmth of Mosaic Canyon in Death Valley National Park, California: Can you see it there? Let’s zoom in on the dark area in the middle of that first photograph…. Ahh! Now that’s a fold to end the week on! Enjoy the weekend, everyone.
No time for more details than that – sorry! Happy Friday and a restful weekend to all!
The Friday fold photo was taken this morning on a GigaPanning expedition, and shows a small syncline within turbidite strata of the Martinsburg Formation, Page Valley, Virginia.
Today, we return to my field trip from last week, for a look at an odd outcrop of the Ordovician-aged Edinburg Formation: Note the car key with green lanyard, to provide a sense of scale. It’s folded, as the yellow bedding traces show in this annotated version: But what really caught my eye about this … Read more
Yesterday, I spent a pleasant day in the field with John Singleton, the new structural geology professor at George Mason University. I was showing John a couple of sites I’ve used as field trip locations for the GMU structural geology class, and John was showing a couple of new sites to me – places he … Read more
The Friday fold comes from the Texas – New Mexico – Chihuahua triple point, on the flanks of Cristo Rey mountain.
A USGS colleague shows Callan a bizarre fold outcrop in the Conococheague limestone of the Boyce quadrangle, Virginia.
A guest “Friday fold” from South Africa: folded gneisses, flavored with other treats of a geological nature.
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
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
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
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
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.
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.
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
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: link