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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 3:18 pm
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The London Bridge.

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bunbury
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 4:40 pm
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Yes, built of the same granite as Hay Tor and quarried nearby. Sold to an American for a couple of million dollars and shipped to Arizona to become a tourist attraction.


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marnixR
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 5:31 pm
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still puzzling though : why would you ship a complete structure halfway across the world ?

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 6:08 pm
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marnixR wrote:
still puzzling though : why would you ship a complete structure halfway across the world ?

As was indicated, money.

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bunbury
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 7:09 pm
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According to Wikipedia:
Quote:
London Bridge has become Arizona's second-biggest tourist attraction, after the Grand Canyon.


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marnixR
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 7:57 pm
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bunbury wrote:
According to Wikipedia:
Quote:
London Bridge has become Arizona's second-biggest tourist attraction, after the Grand Canyon.


really, not Meteor Crater ?

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 8:59 pm
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marnixR wrote:
bunbury wrote:
According to Wikipedia:
Quote:
London Bridge has become Arizona's second-biggest tourist attraction, after the Grand Canyon.


really, not Meteor Crater ?


Last time I was there it was almost like a private viewing.

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
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marnixR
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 9:00 pm
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wow ! any particular reason why ? is it far off the beaten track ?

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Sun Mar 04, 2012 9:12 pm
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marnixR wrote:
wow ! any particular reason why ? is it far off the beaten track ?


Yes, basically from Phoenix, its drive north to Flagstaff and turn right. But, the geology along the way is awesome, Sedona, volcanoes, etc.

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Tue Mar 13, 2012 2:22 pm
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I was able to do a minor field trip this weekend. Below is an image of the south facing valley wall of the Grand River in Lake county Ohio, south of where I live. Generally speaking the Grand River valley cuts through the Devonian Chagrin Shale overlain by the Sharon Conglomerate. The formation of this valley is thought to have formed after the last Wisconsinan ice sheet had withdrawn sometime after +- 14krcybp. The second photo is of the shingle on the south bank of the river. Note that there are no igneous rocks among the shingle other than some resistant chert pebbles of ancient unknown age. I have had several personal conversations with researchers in this area and the cutting of the valley is considered to be an open question. The Pleistocene ice sheets overran this area every time, yet erratics are either rare or nonexistent and the few that can be found are supposed to have rolled down from the surrounding cliffs, which are covered with erratics of all sizes. The valley is sometimes several hundred feet below the surrounding area. The origin and evolution of the Grand River Valley is my geologic project, probably, for the rest of my life.

Image

Image

Link to the Flickr set:

http://www.flickr.com/photos/jlhredshift/sets/72157629211909314/with/6979215655/

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Fri Apr 06, 2012 12:47 am
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Another field trip today, we went to Cascade Park, Elyria, Ohio. The picture below is of Devonian aged Berea sandstone capping soft Bedford shale. The shale crumbles from water action and the sandstone collapses. The falls have migrated more than four miles since glacial times.

Image

Link to all sizes

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
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iNow
Post  Post subject: Re: Geo Photos  |  Posted: Fri Apr 06, 2012 4:49 am
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Fantastic shot!

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Fri Apr 06, 2012 11:13 pm
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iNow wrote:
Fantastic shot!


Thank you.

It's actually four shots specifically taken to work in my PSE software for panorama. I do love my Canon DSLR.

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Tue Apr 10, 2012 11:53 am
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Image

Link to set.

New construction leveling exposed this cross section of what is referred to as "North Ridge", a glacial beach ridge, with several orders of magnitude greater water worn pebbles than is characteristic of the area, which is known for its' massive sand deposits.

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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bunbury
Post  Post subject: Re: Geo Photos  |  Posted: Wed Apr 11, 2012 2:21 am
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I'm no geologist, but I think this is a decent example of an anticline. Lower Cataract lake, Colorado is in the foreground

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Wed Apr 11, 2012 11:52 am
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This mafic weathered glacially grooved erratic got my attention because of its' size, and that they are very rare this far north. While I was there, the property owner showed up and wanted to know why I was there, and it turns out that he was concerned that I might be some kind of state inspector that was going to hassle him. After clearing that up, and discovering that we had mutual acquaintances, he told me the story of how the boulder had got to where it now sits. He owns an excavating company and he had been hired to remove a rock that a farmer had been hitting with his plow. Hand shovel digging revealed about two feet of the weathered/rusted top of the boulder, which prompted calling for an excavator. The owner of the excavating company told me it took both his excavating machine and his bulldozer to lift the boulder on to his equipment trailer. The boulder broke some of the 12x6 wood planking on the trailer. He had to weigh it out of curiosity, and it came in at 30,582 pounds.

Close examination of the boulder shows a generally dark grained aphantic texture, except for randomly scattered, one and two inch books of biotite phenocyrsts, and occasional flakes of pyrite, all indicating the high iron content of the over six foot boulder.

Image

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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iNow
Post  Post subject: Re: Geo Photos  |  Posted: Wed Apr 11, 2012 3:39 pm
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That's cool. Would you anticipate more of it rusting now that it's exposed to air?

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Wed Apr 11, 2012 5:21 pm
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iNow wrote:
That's cool. Would you anticipate more of it rusting now that it's exposed to air?



Yes

But, because of where it was found, the amount of "rusting" that you see is probably about twenty thousand years worth....exhale now.

Edit to add: On the upper left corner, the black area is the plow strike.

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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MeteorWayne
Post  Post subject: Re: Geo Photos  |  Posted: Thu Apr 12, 2012 2:20 am
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You guys would probably find this blog interesting. It was highlighted in Science magazine, it's a rock a day blog by Ian G Simpson of Keele Universtity in the UK:

http://www.geologyrocks.co.uk/blog/hypo ... death_wish


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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Thu Apr 12, 2012 12:58 pm
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MeteorWayne wrote:
You guys would probably find this blog interesting. It was highlighted in Science magazine, it's a rock a day blog by Ian G Simpson of Keele Universtity in the UK:

http://www.geologyrocks.co.uk/blog/hypo ... death_wish


It has been at least five years since I've visited that site and my log in still works, huh. It was pretty bland before, as I have time I'll investigate.

Thanks for reminding me.

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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marnixR
Post  Post subject: Re: Geo Photos  |  Posted: Fri Apr 13, 2012 8:17 pm
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the cliffs of Hunstanton, Norfolk

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lower cretaceous "red chalk" topped by upper cretaceous "white chalk"

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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Fri Apr 13, 2012 9:42 pm
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marnixR wrote:
the cliffs of Hunstanton, Norfolk

lower cretaceous "red chalk" topped by upper cretaceous "white chalk"


So, the "limeys" were under water. :lol:

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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bunbury
Post  Post subject: Re: Geo Photos  |  Posted: Sat Apr 14, 2012 6:47 pm
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I don't have a photo of my own, but this article in today's paper shows another cliff, red sandstone this time, with a rather amazing attachment. A 10 mile long wooden flume was built by gold prospectors 121 years ago. It seems dangerous even for crews with modern equipment. I wonder how many died when it was first built.

http://www.denverpost.com/news/ci_20393 ... ume-clings


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jlhredshift
Post  Post subject: Re: Geo Photos  |  Posted: Thu Apr 19, 2012 1:19 am
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Devonian Limestone with a chalk concretion.

Image

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"The track of a glacier is as unmistakable as that of a man or a bear, and is as significant and trustworthy as any other legible inscription"
John Strong Newberry; 1873


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marnixR
Post  Post subject: Re: Geo Photos  |  Posted: Thu May 10, 2012 8:58 pm
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the classic Cretaceous chalk cliffs of Étretat in Normandie

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"Someone is WRONG on the internet" (xkcd)


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