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Author | Topic: Introduction To Geology | |||||||||||||||||||||||
Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
great job so far (the part on rivers was the best IMHO). Read everything, though recently discovered this gem. I am more of a geomorphology/geodesy guy (but much of this ties in).
Not sure if you haven't got to it yet or if you are going to cover it, butDo you have anything on Sand dunes? I realize you mentioned them in the Deserts (evap exceeds precip) section, but it seemed very brief. I realize that your topic and interest is due to your acceptance of Uniformitarianism, and that Sand Dunes may not always apply to this assumption, but I think they are important to understanding how natural forces (wind) affect the earth (as in soil and rocks). Keep it up this has been great so far.
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Taq Member Posts: 10033 Joined: Member Rating: 5.3 |
Not sure if you haven't got to it yet or if you are going to cover it, butDo you have anything on Sand dunes? I realize you mentioned them in the Deserts (evap exceeds precip) section, but it seemed very brief. I realize that your topic and interest is due to your acceptance of Uniformitarianism, and that Sand Dunes may not always apply to this assumption, but I think they are important to understanding how natural forces (wind) affect the earth (as in soil and rocks).
Our understanding of sand dunes in the fossil record comes from our study of sand dunes in the present. That is uniformitarianism. To start off, I would suggest the wiki page for cross-bedding. It includes pictures of cross-bedded sandstones which are preserved wind blown (eolian) sand dunes. Cross-bedding - Wikipedia
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Pressie Member Posts: 2103 From: Pretoria, SA Joined: |
Hi Artemis Entreri
I agree with you on the work done by Dr Adequate. This thread is excellent. You could of course start reading on sand dunes on Dune - Wikipedia. Don't forget the references at the bottom. You little creationist you: "assumption" and "Uniformitarianism". Edited by Pressie, : Changed whole answer Edited by Pressie, : No reason given.
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Dr Adequate Member (Idle past 305 days) Posts: 16113 Joined: |
I'm on holiday, next week I plan to tell you all about limestone.
--- AE: Thanks for the kind remarks. Was there anything in particular you think I should say about sand dunes? I can always go back and add stuff.
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Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
You little creationist you: "assumption" and "Uniformitarianism". I am not a creationist. Damn talk about assumptions.
Inigio Montoya writes: that word. I do not think it means what you think it means. since you are a fan of Wikipedia.
Wikipedia writes: Uniformitarianism is the assumption that the same natural laws and processes that operate in the universe now, have always operated in the universe in the past and apply everywhere in the universe. It has included the gradualistic concept that "the present is the key to the past" and is functioning at the same rates. Uniformitarianism has been a key principle of geology, but naturalism's modern geologists, while accepting that geology has occurred across deep time, no longer hold to a strict gradualism. Uniformitarianism - Wikipedia the 3rd word in the Wikipedia definition. would you call Wikipedia a creationist for using the word assumption in its definition of Uniformitarianism? Why am I a creationist for saying that?
You could of course start reading on sand dunes on Dune - Wikipedia. Don't forget the references at the bottom.
Well he is going to cover limestone next, I could read about that on Wikipedia too, I am trying to participate HERE, not read random things on Wikipedia. LOOK: I am a cartographer. I have my degree in geography, and where I went to school, geology and geography where in the same school, and I was just really happy that EVC had some frickin earth science as opposed to the biology and chemistry that it is usually inundated with (thanks again Dr Adequate).
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Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
thanks. That is very interesting. Some sand dunes are old (not geologically speaking though), and are constantly changing form and shape.
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Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
well enjoy yourself. what holiday is it? I wouldn't peg you for someone who celebrates Easter, and I can't think of any other holidays right now.
AE: Thanks for the kind remarks. Was there anything in particular you think I should say about sand dunes? I can always go back and add stuff. you are welcome, I have kind words in here somewhere sometimes. I don't really have any suggestions, other than maybe a brief explanation on the various types of dunes (for some reason crescent dunes get all the love), as I said earlier I am most interested in geomorphology, so I am not sure what yo really add, I was just wondering. I did also wonder why there was a section on Deserts in general, maybe it was just a way to classify the material, but desert is more a meteorology term than a geology one. I eagerly await limestone.
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PurpleYouko Member Posts: 714 From: Columbia Missouri Joined: |
"On holiday" is English for "on vacation"
See Cliff Richards hit song from the 60s Summer Holiday Edited by Adminnemooseus, : Off-topic banner.
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Taq Member Posts: 10033 Joined: Member Rating: 5.3 |
I don't really have any suggestions, other than maybe a brief explanation on the various types of dunes (for some reason crescent dunes get all the love), Indeed, they do. However, I happen to live within a very short drive of these wonderful dunes: Bruneau Dunes State Park - Wikipedia They are reportedly the tallest dunes in North America at 470 feet. Interestingly, they do not move and are not the classic mobile crescent shaped dunes. They have remained in their current position since the end of the last Ice Age because the area acts as a trap for windblown sand.
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Taq Member Posts: 10033 Joined: Member Rating: 5.3 |
thanks. That is very interesting. Some sand dunes are old (not geologically speaking though), and are constantly changing form and shape.
What doesn't change are the laws of physics which underlie the mechanisms that produce wind blown (eolian) sand dunes. We can look at modern sand dunes and use that knowledge to detect wind blown sand dunes in the geologic record. This is uniformitarianism. What is interesting is that some creationists claim that the deposits seen in the Grand Canyon were produced by a recent global flood. One of those deposits is the Coconino Sandstone. This deposit has all of the markings of eolian deposits. IOW, there had to be a desert with wind blown sand dunes during the flood. This seems very problematic, at least to me.
{Careful - Starting to head off-topic. This topic is a geology course, not a critique of creationist alternatives - Adminnemooseus} Edited by Adminnemooseus, : Note in red.
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Coyote Member (Idle past 2126 days) Posts: 6117 Joined: |
What is interesting is that some creationists claim that the deposits seen in the Grand Canyon were produced by a recent global flood. One of those deposits is the Coconino Sandstone. This deposit has all of the markings of eolian deposits. IOW, there had to be a desert with wind blown sand dunes during the flood. This seems very problematic, at least to me.
Creationists are not really interested in scientific accuracy or even consistency. Their entire goal is to make things come out correctly--i.e., as they interpret scripture. Facts, especially scientific facts, only get in the way. This lets them "prove" that the Grand Canyon is young, and to attribute it's formation to the global flood some 4,350 years ago based on the evidence of water eroding the sediments deposited by the Mount St. Helens volcano a couple of decades back. That these two examples are so different in all respects doesn't bother them because they can imagine that the results come out supporting their beliefs. Another example of creationists being inherently anti-science while claiming to be just the opposite.
{Careful - REALLY starting to head off-topic. This topic is a geology course, not a critique of creationist alternatives - Adminnemooseus} Edited by Adminnemooseus, : Note in red.Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.
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Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
hmm never hear of that state park before, my ID experience consists of Pocatello. Thanks for the link.
They are reportedly the tallest dunes in North America at 470 feet. I climbed the Dunes at Sleeping Bear Dunes National Lakeshore (in Michigan), and when you climb up that, whew, I swear every one you climb is the tallest one. I think the Kelso Dunes in CA are taller though.Kelso Dunes - Wikipedia Interestingly, they do not move and are not the classic mobile crescent shaped dunes. From imagery it looks like one large continuous Linear Dune, with wind comming from the north-east and north.
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Taq Member Posts: 10033 Joined: Member Rating: 5.3 |
hmm never hear of that state park before, my ID experience consists of Pocatello I live on the West side of the state. Absolutely wonderful geology in the area. My personal favorite is the amazing weathered tuffs at Leslie Gulch (just across the border in Oregon): http://www.blm.gov/or/resources/recreation/site_info.php?... Near Pocatello is the Craters of the Moon national park where you can check out massive lava fields: Craters of the Moon National Monument and Preserve - Wikipedia In between west and east Idaho you can check out a number of massive and very beautiful canyons that are cut through flood basalts such as this one in Twin Falls (the canyon that Evel Knievel couldn't seem to get across): http://www.idahoreporter.com/...s/2012/01/Perrine-Bridge.jpg I am not a geology expert by any means, but the local geology has always interested me. That is why threads like this one always interest me.
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Pressie Member Posts: 2103 From: Pretoria, SA Joined: |
Artemis Entreti
My sentence: You little creationist you: "assumption" and "Uniformitarianism", was written with a big grinning face at the end. I was joking. Edited by Pressie, : No reason given.
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Artemis Entreri  Suspended Member (Idle past 4249 days) Posts: 1194 From: Northern Virginia Joined: |
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