why aren't flowering plants in the lowest layers?

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Originally posted by TrueCreation:
/B]

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Anything added to the oceans in dissolved or fine particulate form will take a considerable time to settle out. Longer than the age of the earth in the YEC timeframe. Its a function of ocean mixing, seawater chemistry, particle and ion adsorption and flocculation, etc.Read this:
...Among Anbar's eventual findings was that iridium's "residence time" -- a measure of the rate of an element's natural removal from the oceans, much as half-life is a measure of the rate at which radioactive materials decay -- is 2,000 to 20,000 years.

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"If a large amount of iridium from a meteorite dissolved in the oceans, it could very well have taken as long as 100,000 years for the contamination to wash out, and the sediments deposited during that time would reflect the oceans' elevated concentrations," Anbar says. NEW METEOR DINO DEATH LINKIn the YEC timeline, the iridium from this meteor has to be spread to the entire world's oceans in a matter of minutes or hours, which requires very vigorous mixing. Then it has to settle out in another short time - minutes or hours - which cannot happen in a real ocean, especially one being mixed so vigorously. Otherwise the iridium anomaly would be spread throughout the entire geologic column, not concentrated in a layer only millimeters to centimeters thick.

[QUOTE]Originally posted by TrueCreation:
[b]--Nice link, however do you have the variables handy which were used to calculate this? ie, do you have the data?[/QUOTE][/b]
Anbar, A. D., G. J. Wasserburg, D. A. Papanastassiou, and P. S. Andersson, Iridium in natural waters, Science , 273, 1524-1528, 1996 http://www.sciencemag.org/cgi/content/abstract/273/5281/1524[QUOTE]--This is another nice link and a graph of the concentration of iridium, the format is interesting by which it decreases in quantity. http://rainbow.ldeo.columbia.edu/courses/v1001/impact23.html[/B][/QUOTE]It seems to decay exponentially over tens of thousands of years, corraborating Anbar's numbers very nicely.

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Originally posted by TrueCreation:
"Anbar, A. D., G. J. Wasserburg, D. A. Papanastassiou, and P. S. Andersson, Iridium in natural waters, Science , 273, 1524-1528, 1996

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http://www.sciencemag.org/cgi/content/abstract/273/5281/1524
--I don't think I'm able to access this, would you post the abstract or the article here, we can keep it a secret . Or something to get around this.

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Its a free registration to get the abstract. you should sign up for it. The full article is in the library. I don't have online access to the full text.Abstract:
Iridium in Natural Waters
A. D. Anbar, * G. J. Wasserburg, D. A. Papanastassiou, P. S. Andersson

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Iridium, commonly used as a tracer of extraterrestrial material, was measured in rivers, oceans, and an estuarine environment. The concentration of iridium in the oceans ranges from 3.0 (1.3) 108 to 5.7 (0.8) 108 atoms per kilogram. Rivers contain from 17.4 (0.9) 108 to 92.9 (2.2) 108 atoms per kilogram and supply more dissolved iridium to the oceans than do extraterrestrial sources. In the Baltic Sea, 75% of riverine iridium is removed from solution. Iron-manganese oxyhydroxides scavenge iridium under oxidizing conditions, but anoxic environments are not a major sink for iridium. The ocean residence time of iridium is between 2 103 and 2 104 years. I'll be gone for 8 days, so you'll have to carry on without me. You could do some research into other iridium enrichment layers in the GC. They are quite common. Most are from normal volcanism. Every such layer requires many millenia to settle out. Of course we already knew that from the nature of the deep sea sediments these samples are taken from - no rapid deposition of siliceous and calcareous oozes, thank you.
Not good for the YEC model.