Geobulletin alpha

News from the Geoblogosphere feed

by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Posts treating: "Virginia"

Wednesday, 04 May 2016

sort by: date | clicks

3rd North American Symposium on Landslides (NASL) 2017 

The Landslide Blog [2016-05-04 08:35:24]  recommend  recommend this post  (187 visits) info

 Ordovician; US,CA
The 3rd North American Symposium on Landslides will be held in Roanake, Virginia in June 2017, hosted by the AEG and the Canadian Geotechnical

Scientists find likely cause for recent southeast U.S. earthquakes 

AGU Meetings [2016-05-03 16:25:11]  recommend  recommend this post  (202 visits) info

 US
The southeastern United States should has seen some notable seismic events – most recently, the 2011 magnitude-5.8 earthquake near Mineral, Virginia that shook the nation’s capital. Now, scientists report in a new study a likely explanation for this unusual activity: pieces of the mantle under this region have been periodically breaking off and sinking down into the

The Early Anthropocene Hypothesis: An Update 

Real Climate [2016-03-15 16:43:31]  recommend  recommend this post  (139 visits) info

 US
Guest post from Bill Ruddiman, University of Virginia For over a decade, paleoclimate scientists have argued whether the warmth of the last several thousand years was natural or anthropogenic. This brief comment updates that debate, also discussed earlier at RC: Debate over the Early Anthropogenic Hypothesis (2005) and An Emerging View on Early Land Use

Timberville 

Mountain Beltway [2016-03-15 14:03:50]  recommend  recommend this post  (142 visits) info

 US
Join Callan for a virtual field trip, as he shares dozens of photos from a recent 'field review' of a new geological map in Virginia's Valley & Ridge province. Highlights: graptolites, trace fossils, geopetal structures, folds and

Eatonia sp. brachiopod from the Bois d'Arc formation of Oklahoma 

Views of the Mahantango [2016-03-01 09:01:00]  recommend  recommend this post  (631 visits) info

 Devonian,Silurian; CA,US
img
I believe that this next Brachiopod is an Eatonia sp. While Eatonia medialis is listed by Amsden* as being known from the Haragan and Bois d'Arc formations of Oklahoma, the specimen below does not appear to conform to specimens I have found in the Kalkberg formation of New York or Licking Creek formation of Virginia (both formations are correlative to the aforementioned Oklahoma formations).The shell is rounded to sub-pentagonal in shape with coarse plications. The pedicle valve has a sulcus [...]

Chesapectin jeffersonius pelecypod from the Yorktown formation of Virginia 

Views of the Mahantango [2015-09-01 09:01:00]  recommend  recommend this post  (223 visits) info

 Neogene; US
img
I acquired this shell at a rock/fossil/mineral show this past spring from someone who collected it themselves. It's a Chesapectin jeffersonius pelecypod from the Yorktown formation (Neogene, Pliocene epoch, Zanclean stage) of Virginia and was found along the James River.  The shell is enormous and I can just imagine what the scallops would have tasted like! It's only a single valve, I'm not sure if it is the left or the right but was a host to some epibionts. There are large barnacles [...]

Stromatoporoids in a Devonian reef 

Mountain Beltway [2015-08-20 15:03:31]  recommend  recommend this post  (150 visits) info

 Devonian; US
Here are a few shots of a Devonian aged reef exposed in Mustoe, Virginia – one of the sites I visited this spring with GMU’s Rick Diecchio, when he led his sedimentology and stratigraphy trip there. At first, the outcrop made no sense to me – I kept searching for bedding, and failed to find it. Then, the reef interpretation clicked, and suddenly I didn’t “need” bedding any more… Stromatoporoids

Friday fold: Yin-Yang at Swift Dam 

Mountain Beltway [2015-08-07 15:14:27]  recommend  recommend this post  (185 visits) info

 US
What is Matt looking at here? Matt was one of my Rockies students this summer, a geology major at the University of Virginia. Together with another UVA student and students from Mary Washington University and George Mason University, Matt embarked on a mountain-climbing hike during our evening camping at Swift Dam, near Depuyer, Montana. The hikers were treated to an extraordinary sight when they attained the summit: Click to embiggen;

Fault breccia in Beekmantown limestone 

Mountain Beltway [2015-04-17 14:14:36]  recommend  recommend this post  (192 visits) info

 Paleogene; US
Here’s another sight at the Eocene dikes site in Bluegrass Valley, Virginia, mentioned yesterday: That’s a gorgeous fault breccia, emplaced parallel to bedding, and parallel to the felsic dike (which can be found a few feet to the west / right of these photos): It was very poorly lithified, shockingly crumbly to the touch, considering the big slab of rock downhill (to the right) of it. Here’s a link to

Compare and contrast: Two Chesapectens 

Mountain Beltway [2015-04-14 12:21:14]  recommend  recommend this post  (127 visits) info
Two new GIGAmacro images of fossil scallops from Virginia’s Coastal Plain - Chesapecten nefrens: link Chesapecten jeffersonius: link My vision is to get the opposite side of each of these samples as well as a half-dozen other species in this genus, perhaps even multiple individual specimens of each species, to allow students to do a lab where they plot morphological changes over geologic time as an example of what the

A Scientific Debate 

Real Climate [2015-04-13 15:40:14]  recommend  recommend this post  (142 visits) info

 US,AU
Guest posting from Bill Ruddiman, University of Virginia Recently I’ve read claims that some scientists are opposed to AGW but won’t speak out because they fear censure from a nearly monolithic community intent on imposing a mainstream view. Yet my last 10 years of personal experience refute this claim. This story began late in 2003

Spring Marches North: The View from Space 

Dan\'s Wild Wild Science Journal [2015-04-13 04:58:23]  recommend  recommend this post  (146 visits) info

 US
This is from the NASA Aqua satellite. You can see the green of spring moving into Virginia, while snow remains in the Adirondacks. High resolution, color imagery from polar orbiting satellites allows folks like me to better tell the story of our planet to our TV audience and to our online viewers as well.

Zoophycos trace fossils in Mahantango Formation, Fort Valley 

Mountain Beltway [2015-03-19 21:25:42]  recommend  recommend this post  (105 visits) info

 Devonian; US
A morning's field trip yields an outcrop of excellent Zoophycos trace fossils in southern Fort Valley,

February 24, 2015 

Geology.com News [2015-02-24 07:10:25]  recommend  recommend this post  (131 visits) info

 CA,US
New USGS Topos for NevadaUnited States Geological Survey Cavern Below MontrealMTL BLOG Fracking Quakes in Alberta ?Bloomberg Business Cavers in Two Tone Cave, NZCaving News Virginia Earthquake Aftershocks Identify Previously Unknown Fault ZoneUnited States Geological Survey Coping with Earthquakes Induced by Fluid InjectionUnited States Geological Survey WV Rail Explosion Fuels Keystone Pipeline InterestForbes The Time

Pygidium from the Strasburg Museum 

Mountain Beltway [2015-01-05 13:13:51]  recommend  recommend this post  (145 visits) info

 US
My family and I went to the Strasburg Museum in Strasburg, Virginia, last fall, because (1) we’ve lived out here for two and a half years now without stopping in, and we felt “overdue” for checking it out, and (2) a big train is prominently featured out front, and my son is really keen on trains right now due to the “Thomas the Tank Engine” series of books. I don’t

Happy Karl Terzaghi's Birthday 2014! 

GeoPrac.net [2014-10-02 14:53:25]  recommend  recommend this post  (641 visits) info

 US
It's October 2 again, and today would have been Karl Terzaghi's 131st birthday. As I was reflecting on Terzaghi and some of his quotes, I was reading a passage from Professor's Goodman's biography1 that described a talk that he gave in 1924 entitled "The Way to Happiness." I thought this would be a nice change of pace from some of his more famous quotes and topics. Here are some selections from Goodman's description of the presentation. ...This stems from application of the law of [...]

AEG-BWH Meeting, September 18 

DC Geology Events [2014-09-10 21:29:29]  recommend  recommend this post  (848 visits) info

 US
Geologists and students: I want to personally invite you and your colleagues to the September 18, 2014 AEG-BWH meeting featuring David Spears, the State Geologist of Virginia. His topic is one that every geologist should hear. The meeting is in … Continue reading

Benchmarking Time: DC is all about boundaries 

Magma Cum Laude [2014-07-22 20:13:14]  recommend  recommend this post  (114 visits) info

 US
Washington DC is an interesting city. When the original plans were being made in the 1780s and 1790s, they called for a 100-square-mile area to be allocated for the city, and George Washington (who was President at the time) wanted to include the City of Alexandria in Virginia. But the Residence Act, passed in 1791, specified that all the federal buildings had to be on the Maryland side of the river (mostly because someone realized that the law allowed the President to choose the location and [...]

Weathering on Old Rag Mountain 1: feeder dikes 

Mountain Beltway [2014-06-16 15:04:18]  recommend  recommend this post  (116 visits) info

 US
Old Rag Mountain is a distinctive mountain in the eastern Blue Ridge of Virginia, contained in a little lobe of Shenandoah National Park. It’s a great hike on several levels: (1) it’s got no trees on the summit, so you can actually get a decent view from on top, (2) it’s got a great section of full-body rock scrambling on the Ridge Trail, and (3)  it’s long (9.2 miles round

Slickensides in the Vulcan Quarry, Manassas, Virginia 

Mountain Beltway [2014-06-12 14:51:36]  recommend  recommend this post  (71 visits) info

 US
While at the Vulcan Quarry in Manassas, Virginia, a few weeks ago, the principle interesting feature I saw on the individual blocks of rock we sorted through was slickensides. I saw dozens and dozens of examples, in both the hornfels and the diabase, but here are five nice examples to share: No sense of scale on this last one, because I didn’t feel safe edging up to the quarry wall
Stratigraphy.net | Impressum
Ads: