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Radiometric dating involves the use of isotope series, such as rubidium/strontium, thorium/lead, potassium/argon, argon/argon, or uranium/lead, all of which have very long half-lives, ranging from 0.7 to 48.6 billion years. Subtle differences in the relative proportions of the two isotopes can give good dates for rocks of any age.
The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old. Since then, geologists have made many tens of thousands of radiometric age determinations, and they have refined the earlier estimates. A key point is that it is no longer necessary simply to accept one chemical determination of a rock’s age. Age estimates can be cross-tested by using different isotope pairs. Results from different techniques, often measured in rival labs, continually confirm each other.
Every few years, new geologic time scales are published, providing the latest dates for major time lines. Older dates may change by a few million years up and down, but younger dates are stable. For example, it has been known since the 1960s that the famous Cretaceous-Tertiary boundary, the line marking the end of the dinosaurs, was 65 million years old. Repeated recalibrations and retests, using ever more sophisticated techniques and equipment, cannot shift that date. It is accurate to within a few thousand years. With modern, extremely precise, methods, error bars are often only 1% or so.
The advantage of isochron dating as compared to simple radiometric dating techniques is that no assumptions about the initial amount of the daughter nuclide in the radioactive decay sequence are needed.
Originally posted by Horza
Edit -
The advantage of isochron dating as compared to simple radiometric dating techniques is that no assumptions about the initial amount of the daughter nuclide in the radioactive decay sequence are needed.
[edit on 7/3/09 by Horza]
Originally posted by saturnine_sweet
Next would be according to stratification. This is based on an ASSUMPTION about how long it takes for various strata to form, an assumption shaped by a belief in evolution. By a FAITH in evolution. As it is based on an assumption, the only real fact that can be taken from it is that, in most cases, though not all, the lower item came first, though we cannot confirm how long before, unless it is within the calibrated C14 range.
so some how ..which you havnt said iocronic ating doent work ... ok what about the ret of the radiometric dating methodology that iochron is only a small part of?
Third, the long range method, isochron dating. Again, not too hard to invalidate. Why? Because initial ratios are assumed according to the FAITH that it has to be within a certain range. Data that does not fit is simply excluded.
Now, Im sure I'll get inundated with requests for links to back this up. But there is actually no need; it applies to every case, so looking up any example with yield proof.
hahha the only thing transparent around here is the nonsense you just read on a creationist website an put here in your own words
Sadly, a great deal of evolution "fact" is as transparent as this.
Originally posted by saturnine_sweet
This lovely link points out the flaws in the isochron dating in more technical terms.
The ages yielded by large phlogopites from xenoliths are, however, commonly older than the eruption, a phenomenon that has been interpreted as the incorporation of excess radiogenic Ar from a deep fluid source.
baseless ?
Originally posted by saturnine_sweet
reply to post by noobfun
Exactly where did I say anything about carbon dating rocks? That is just a baseless personal attack that has nothing to do with anything.
Next would be according to stratification. This is based on an ASSUMPTION about how long it takes for various strata to form, an assumption shaped by a belief in evolution. By a FAITH in evolution. As it is based on an assumption, the only real fact that can be taken from it is that, in most cases, though not all, the lower item came first, though we cannot confirm how long before, unless it is within the calibrated C14 range.
Stratification in archaeology is the formation of layers (strata) in which objects are found.
Stratification of rock layers (strata) is part of the geologic field of Stratigraphy.
strata (geology), a sequence of discrete rock layers used for age dating and identification of concurrent regional or worldwide events in the geologic record.
but they are within the strata not the strata, and stratification ONLY refers to the layers nothing contained within
You're not an idiot, you know that the "geological column" is inherently cross-linked with C14 dating of the organic material contained within,
learn how to use correct terminoligy not just shove any old word in becasue it sounds all sciencey
Learn how to debate the science rather than attack the messenger, and you might get respect in return.
Originally posted by saturnine_sweet
reply to post by noobfun
Exactly where did I say anything about carbon dating rocks? That is just a baseless personal attack that has nothing to do with anything. You're not an idiot, you know that the "geological column" is inherently cross-linked with C14 dating of the organic material contained within, if said material is considered recent enough to C14 date. Im not even going to bother reading the rest of your post, or replying to you again. I will not honor someone who makes such spurious attacks with my time. Learn how to debate the science rather than attack the messenger, and you might get respect in return.
The 2004 version of the calibration curve extends back quite accurately to 26,000 years BP. Any errors in the calibration curve do not contribute more than ±16 years to the measurement error during the historic and late prehistoric periods (0 - 6,000 yrs BP) and no more than ±163 years over the entire 26,000 years of the curve, although its shape can reduce the accuracy as mentioned above.[11] (Link to graphs: [1])
en.wikipedia.org...
Standard calibration curves are available, based on comparison of radiocarbon dates of samples that can be dated independently by other methods such as examination of tree growth rings (dendrochronology), deep ocean sediment cores, lake sediment varves, coral samples, and speleothems (cave deposits).
www.flmnh.ufl.edu...
The only way to resolve this uncertainty is to calibrate the C14 dates with calendar dates. This calibration has been done by compiling a dendrochronological (tree-ring) record and painstakingly figuring the C14 age of these tree rings. This tree-ring record now extends back about 11,500 years, and by comparing the calendar age of the tree rings with their radiocarbon age,
Originally posted by saturnine_sweet
reply to post by noobfun
Sweet Jesus, work on your reading comprehension. Im not going to explain to you what that paragraph meant. But trust me, it had nothing to do with carbon-dating rocks.
www.angelfire.com...
But there is the problem. They assume dinosaurs lived millions of years ago (instead of thousands of years ago like the bible says). They ignore evidence that does not fit their preconceived notion.
What would happen if a dinosaur bone were carbon dated? - At Oak Ridge National Laboratory, Scientists dated dinosaur bones using the Carbon dating method. The age they came back with was only a few thousand years old
as the only meaning of your terminoligy of stratification means rocks and layers of rocks unless your now saying you did mean c14 dating rocks im at a total loss for what you are trying to say
Originally posted by saturnine_sweet
I used the precise terminology I intended, and used it correctly. I don't know what else to say there.
...you do realise i was giving an example of where wrong terminology or misused terminology leads to wrong impressions
In regards to your attacks, Im not talking about any creationism here.
actually its a war of accuracy i correct pro and antis' alike if they get it wrong .... only by bieng honest and accurate as possible can you hold the moral high ground in any debate
But you are proving my point about how it is a religious war for most people on both sides.
Originally posted by B.A.C.
I believe in a Creator.
I acknowledge there is a lot of evidence for evolution just not enough for me to give up my faith, that's all.
got a coffee mug and a cigarette will that do?
Please, put down your torch and pitchfork,
again same thing stratification dating is based on assumption of how long the rock layer takes to form,
and read what i said with a calm mind. Perhaps then you will understand what I was saying.
well as tyour talking about rock layers the lowest items are rocks .. no mentions of anything included thats organic just rocks and its ability to be dated within c4's date range
the lower item came first, though we cannot confirm how long before, unless it is within the calibrated C14 range.
You do realize that there are many, many examples of such "fossils" that still contain organic tissue?
The paleontologist and her colleagues removed mineral fragments from the interior of the femur by soaking it in a weak acid. The fossil dissolved, exposing a flexible, stretchy material and transparent vessels.
many many is a light exageration theres a few, and its not in anyway inconvenient they have been shown to be residue of bacteria tha was eating the fossil and became trapped no inconvenien in he slightest the residue is alos well over he 50,000 year ability for c14 testing so other methods
Originally posted by saturnine_sweet
Oh...and about the dinosaur bones. You do realize that there are many, many examples of such "fossils" that still contain organic tissue? I realize how inconvenient that is, but it is no less true.
sorry are you refering to the callogen fragments recovered from the bacterial residue?
After all, that is the very place where "evidence" of birds coming from dinosaurs comes from.
Your dogma and parroted talking points are great. But they are not debate, they are not discussion