|WikiProject Geology||(Rated Start-class, Low-importance)|
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The article was a mess of raw HTML, and it looks to have been that way from the beginning. A bot came through recently and removed the paragraph tags which is what made the need for wiki markup evident. It still could use some refinement, but it's better. Yock (talk) 18:27, 9 April 2008 (UTC)
Every kind of 'dating' measures how long ago... something... happened. For C14, it's how long ago the carbon was alive, cuz the c14 is generated in the upper atmosphere at a known rate, and is therefore incorporated into living things. For Archaeomagnetic dating, it's how long ago the iron was liquid and then solidified, capturing the global magnetic field at that time.
So what is it with Lead-Lead dating? I get the impression it was the age of the (assumed) supernova explosion that created all our heavy elements, is that right? Cuz LeadLead is only used for dating the earth (one supernova date) and for metorites (from other places from other supernovas, potentially). And other rocks in the world will just give you the same answer for the earth, yawn. Is that right?
I agree it's unclear as written. I get the impression that it measures the time since the rock solidified, since that's when the initial Pb/U ratio would be fixed, Vilhelm.s (talk) 21:24, 14 September 2011 (UTC)
"Assuming X is Y" replaces "X is Y therefore" when no citation is given
Under The Formation of the Geochron, first paragraph,
Changed "The process of isotopic differentiation is identical on Earth as it is on other planets, therefore the core of these planetesimals would be..."
To "Assuming the process of isotopic differentiation is identical on Earth as it is on other planets, the core of these planetesimals would be..."
No reference is given for "The process... is identical..." This should be treated as an assumption. firstname.lastname@example.org 2012-01-06 — Preceding unsigned comment added by 188.8.131.52 (talk) 19:02, 6 January 2012 (UTC)