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You are browsing the archive for August 2013 - Mountain Beltway.

30 August 2013

Friday fold: Archean BIF from Montana

My NOVA colleague Shelley Jaye brought this gorgeous banded iron formation fold back from the Archean of Montana: Gorgeous to think about what this rock represents: (1) an anoxic atmosphere, a world where iron was able to dissolve in seawater; (2) some addition of oxygen, causing the iron to precipitate out as iron oxide minerals, (3) burial to some enormous depth where rocks behave gooey-like, (4) tectonic stresses that caused …

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29 August 2013

Guest post: Glaciation in the Tetons

This is the fourth of several guest posts that appear here this week, all written by students who participated in this past summer’s Regional Field Geology of the Northern Rocky Mountains course. by Tony Robinson Old Dominion University

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28 August 2013

Guest post: The Huckleberry Ridge Tuff in the greater Yellowstone area

This is the third of several guest posts that will appear here this week, all written by students who participated in this past summer’s Regional Field Geology of the Northern Rocky Mountains course. by Matthew Mann University of Virginia The Huckleberry Ridge Tuff is a 2.1 Ma tuff deposit that is centrally located in Yellowstone (Figure 1), but can be found throughout much of the United States (Figure 2). The …

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27 August 2013

Guest post: The Belt Supergroup in Glacier National Park

This is the second of several guest posts that will appear here this week, all written by students who participated in this past summer’s Regional Field Geology of the Northern Rocky Mountains course. by Cate Pearson University of Virginia A drive along Going-to-the-Sun Road is an amazing experience for many reasons. To any traveller, the stunning vistas and landscapes are breathtaking. To the more geologically inclined, a journey through Glacier …

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26 August 2013

Guest Post: Glaciation in Glacier National Park

This is the first of several guest posts that will appear here this week, all written by students who participated in this past summer’s Regional Field Geology of the Northern Rocky Mountains course. by Madeleine Rushing Northern Virginia Community College Sedimentary deposition typically is seen as horizontal strata, layered one on top of the other with oldest deposits on the bottom, getting progressively younger with each layer. Which makes sense, …

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Monday macrobug: spiky caterpillar

I’m pretty sure this guy is advertising himself as inedible…

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22 August 2013

Natural Bridge, Virginia

Our three-day karst theme wraps up today with a visit to Natural Bridge, Virginia, an impressive sight: I went to Natural Bridge early last week to give a talk to a group of Road Scholars (an Elderhostel-like program) about the Snowball Earth. Part of my compensation for the talk was a night’s lodging at the Natural Bridge hotel, meals, and tickets to the Natural Bridge’s suite of six tourist attractions, …

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21 August 2013

A visit to Luray Caverns

To continue with the karst theme I initiated yesterday, let me share a few photos today from a visit last week to Luray Caverns, a large show cave in Page County, Virginia near the town of Luray. This was my first visit to Luray Caverns since I was a child. Probably it had been thirty years since I last trod these limestone halls… It was nice to go back. While …

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20 August 2013

A new old sinkhole on Oranda Road

Take a look at this… Doesn’t look like much, does it? But it’s actually the surface expression of a vast, long-lived sinkhole. If you walk over to the hole and look in, you can’t see the bottom. It’s semi-supported by limestone boulders, but between the boulders, the soil and gravel filter down, down, down, like the sands in an hourglass. My friend and neighbor Diane Artz Furlong, who also shared …

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19 August 2013

Monday macrobug: Saddleback caterpillars

My neighbor, the artist Diane Artz Furlong, photographed these extraordinary caterpillars in her garden last week. With her permission, I’m reposting the photos here… Diane writes that, Just when I thought I was done with the Japanese beetle onslaught (not!) I find these guys on my rose bush. I would never have found them, though, had I not brushed my hand up against them. They sting! Quite painfully, too. They …

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