Callan Bentley Our GIGAmacro photographic imaging system was built by Gene Cooper Four Chambers studio. They’ve also made a neat comparative GigaPan viewer available online. Here are 3 demonstration videos I just shot of how this sort of thing works: one macro sample of oolitic limestone, one of the flood/not-flood of Passage Creek, and one of a … Read more
Following the “monster” that was the Friday fold two weeks ago, here are some more folds in the Noonday Dolostone (“Dolomite”) in Mosaic Canyon, Death Valley, California: Zooming in on this isoclinal fold: Bedding traces annotated, highlighting the “similar” style of folding (hinge thickened; limbs thinned): A very different style of folding, observed a few … 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
A quick poll: What do you think of extra credit as an option in teaching? I’m in the beginning stages of designing an online course, and because of inter-campus politics at NOVA, I’ll be co-designing it with a team of four other people, three of whom I know pretty well and totally respect. Still: one … Read more
Everything’s bigger in Texas, even the footprints…
After Passage Creek receded following last week’s flood, I went down to the bridge and the floodplain to have a look around. Here’s a little bit of what I saw… Let’s start at the bridge itself. The view is to the west, and Passage Creek flows north: On the other side of the bridge, looking … Read more
It’s time for an update from the Mid-Atlantic Geo-Image Collection! The rest of Team M.A.G.I.C. is finally catching up with Robin Rohrback-Schiavone, although in this case she’s got a handicap since our GIGAmacro rig has (once again) developed a bug. It’s a tricky bit of business keeping that thing happy – but it sure does … Read more
Saw these porcupine-like ice spikelets this morning in a frozen puddle:
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
After a night of torrential rain, Callan wakes to find his sole (vehicular) route to the outside world under several feet of flood water.
A friend of the family sent me these photos from coastal Ecuador, where these fast-working wasps rapidly constructed a nest. Photo #1 is from Tuesday morning, and photo #2 is on the afternoon of the same day!
Some of the dynamics of small-scale mass wasting in granular materials are captured in this animated GIF from sand dunes in Death Valley.
South of Searles Lake is a distinctive landform: the Trona Pinnacles. This multi-image photomosaic is too small for GigaPan, but I’ve made a medium-sized version of it that can be hosted here. You’re going to have to click through to see it large, though. Click to enlarge These are tufa towers (like we saw at … Read more
I’ve mentioned this phenomenon before, but I thought this was a particularly impressive example, found in my back yard over the weekend. Pipkrakes (ice “fibers”) with iron oxides and oak leaves, Fort Valley, Virginia, January 2013. Dana saw some in Seattle, too.
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
These are exposed on the road leading in to Death Valley from the Panamint Valley to the west. That’s all I’ve got time for today, folks – gotta get to work.
This image is from the canyon in which route 168 ascends the Inyo Range from Big Pine, California. View is to the south/southwest. Those are gravel layers that dip gently westward. I think they’re associated with the underlying Waucobi Lake Beds, which are Plio-Pleistocene in age. The lake beds are made of finer stuff, but … Read more
What can you tell me about this new fold sample I recently acquired? Width of sample is 12.5 cm. The face you’re looking at was cut but not polished. Here’s a close up: With layering annotated, to highlight the disharmonic nature of these folds: Anyone have any guesses what’s going on here? ——————– UPDATE —————— … Read more
October 2012 was a bumper month for macrobugs here at Bentley Farm. But… none more so than the ladybugs: One of the downsides to living way out in the sticks is that we have to deal with a lot of insects. Mostly, I relish this interaction, as the “Monday Macrobug” series attests. But the gnats, … Read more
Okay, I’ll bite. I work at making people understand more about the big rock that we live on. I use pictures and drawing on the pictures to show how the rocks have changed because of pushing on the rocks. This pushing happens because of blocks of rock that move together and sometimes push into other … Read more