Here are two views of a single anorthosite cobble, collected in the Adirondack Mountains of upstate New York: Raw, natural surface: [gigapan id=”185220″] Link Slabbed and polished surface: [gigapan id=”185217″] Link As you zoom in and explore these GIGAmacro images, see if you can find the delicate little “necklaces” (reaction rims) of garnet wrapping around … Read more
Here are some new “virtual samples” for you to check out: Dessication cracks in Tonoloway Formation (Silurian): [gigapan id=”183042″] Link Image by Callan Bentley Random conglomerate (unknown age and formation): [gigapan id=”183322″] Link Image by Robin Rohrback Skolithos trace fossils (tops) in Hampshire Formation (Devonian): [gigapan id=”183132″] Link Image by Callan Bentley Crinoid calyx fossil … Read more
My Historical Geology class was in for a new experience for the semester’s capstone field trip. Before we headed out into the field (to the exceptional roadcuts along Corridor H in Grant and Hardy Counties, West Virginia), we had them examine all the outcrops virtually, in the comfort of the classroom, using digital imagery. I … Read more
I’ve been thinking lately about Harpers Ferry, the spot where West Virginia, Virginia, and Maryland meet, at the confluence of the Potomac River and the Shenandoah River. I’ve noted small outcrops of its overturned beddding here previously, and also described a book I read about the man who made the place infamous: John Brown. I … Read more
Hampshire Formation outcrops on Corridor H, West Virginia: [gigapan id=”178008″] link (Marissa Dudek) [gigapan id=”177198″] link (Callan Bentley) Faults in the Tonoloway Formation, Corridor H, West Virginia: [gigapan id=”176602″] link (Marissa Dudek) Conococheague Formation, showing stromatolites and cross-bedding: [gigapan id=”177155″] link (Callan Bentley) [gigapan id=”177355″] link (Jeffrey Rollins) Tiny folds and faults, from a sample … Read more
Some time ago, I featured as Friday fold the extraordinarily complex duplex structure to be seen in the Cretaceous “gastropod limestone” member of the Kootenai Formation at Sandy Hollow, Montana. Today, let’s take a deeper look through a couple of hand-shot GigaPan images: Here’s the bigger of the two: [gigapan id=”176119″] link Here’s one with … Read more
Recently, I posted about an excellent road cut in Fort Valley showing well-developed 10 cm+ Zoophycos trace fossils. Presented here are three new GigaPan images (two outcrop; one macro) of Zoophycos from the Devonian-aged Mahantango Formation: [gigapan id=”170978″] link [gigapan id=”170977″] link [gigapan id=”170875″] link These images are part of a new “virtual field trip” … Read more
My student Robin has been busy cranking out great new macro GigaPans. Check out a few of these new examples: [gigapan id=”169173″] link [gigapan id=”169045″] link [gigapan id=”169028″] link [gigapan id=”169039″] link [gigapan id=”168879″] link [gigapan id=”168843″] link [gigapan id=”168841″] link [gigapan id=”168794″] link
Pisolites are large primary concretions that develop in backreef or lagoonal settings such as the Permian Tansil Formation of New Mexico, into which is cut the enormous hole called Carlsbad Caverns.
Three images, working our way in from outcrop setting to hand sample: [gigapan id=”168000″] link [gigapan id=”168012″] link [gigapan id=”163085″] link These fine red sandstones are the Silurian-aged Bloomsburg Formation, as it crops out in Fort Valley, Virginia. What would we see if we kept zooming in? …Stay tuned…