Questions tagged [dating]

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Calibration of OSL dates to calender year dates

I am trying to utilize a function that uses calibrated $^{14}C$ dates. However, my data consists of OSL dates, not $^{14}C$. Searching google scholars did not provide any useful results. Since OSL ...
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2answers
49 views

Can we carbon-date the remains of homo floresiensis found in 2003?

According to the Wikipedia article on the species Homo floresiensis, the remains discovered in 2003 consist of unfossilized bones. I would assume that means they are still composed of the original ...
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2answers
74 views

How do we know the rate of decay for radiometric dating is constant?

http://www.purdue.edu/newsroom/research/2010/100830FischbachJenkinsDec.html The link above talks about a research paper from Purdue University that the researchers had detected slight fluctuations in ...
2
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1answer
31 views

Potassum-Argon Dating and Proportions of Daughter Products in Potassium 40 Decay Channel

So Potassium 40 decays in such a way that roughly 89% of it becomes Calcium 40 and 11% of it becomes Argon 40. When they list these figures are they implying that after 1 half-life, of the 50% of the ...
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0answers
26 views

Age of the Earth without radiometric dating?

It is common knowledge that age of the Earth is roughly 4.5 billion years. Radiometric dating of meteorites (which were formed during the formation of Earth) and earliest rocks on Earth have both ...
2
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2answers
150 views

Radiometric dating data sets

I am in the process of learning what sort of data is collected with radiometric dating techniques, used for absolute dating. It sounds like there are two primary ones: Radiocarbon dating (~50k year ...
7
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1answer
278 views

What is the oldest fossil on Earth?

What is the oldest fossil ever found on Earth? Where and when was it found? What was the oldest fossil with a brain with 2 hemispheres ever found?
3
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1answer
60 views

Giem's article on carbon dating

I don't want to start any controversy. I'm just curious about what could professional geologists say about this paper, and what is it's current scientific status, since I couldn't find any serious ...
3
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0answers
286 views

Puzzle using relative dating principles

This isn't directly looking at a real life ecological example kind of thing, but it requires knowledge of relative dating, so I thought I would come here. Here is what was told: -"Worms" (curved ...
3
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1answer
96 views

How to sample for K-Ar dating?

How much sample of volcanic rock is required to undertake a K-Ar date measurement, and does it matter if the rock contains vesicles? Are there tricks of the trade to get a good sample?
3
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2answers
75 views

Source of Dresser Formation 3.5 Ga dating

I've seen many papers and sites that give the dating of Australia's Dresser Formation as 3.5 Ga (variously 3.48 or 3.49 Ga), but I can't seem to find the source of this. Where does the dating come ...
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1answer
4k views

How old is the Earth?

According to most articles I've read online, the estimated age of Earth is 4.5 billion years. Question: How old is the Earth? So I actually want to confirm that this is the case. Maybe there are ...
7
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1answer
198 views

Why is ocean salinity not a good chronometer?

In 1910, George Becker published The Age of the Earth, in which he used the sodium accumulation rate in the ocean to estimate the earth's age as 50 to 70 million years. We now know through various ...
7
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1answer
125 views

How good is K-Ar dating?

I don't doubt that K-Ar dating of rocks is a sound method, but in discussions with skeptics it would be good to know just how reliable exactly? For example, has K-Ar been cross-checked with other rock ...
7
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1answer
2k views

How does argon-argon dating work - need a simple but not-wrong explanation

The Washington Post article Scientists discover hundreds of footprints left at the dawn of modern humanity describes the geological dating of stratified layers of mud by analyzing and dating minerals ...
3
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1answer
327 views

Relative dating of intrusion

I am quite new to geology and have a realtive dating problem which I am a bit unsure of. I know very well the principle of superposition, principle of cross-cutting, etc., but am still a little bit ...
3
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1answer
107 views

Why can isotopes reflect the age of the Earth rather than the age of the supernova that created them?

Radiometric dating is based on heavier elements decaying into lighter elements, for example uranium decaying to lead. But wasn't all uranium in the Solar System created in one or more supernova? And ...
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91 views

Dating fluvial terraces with $^{10}\rm{Be}$

I've completed part A of the question below. Dating fluvial terraces with $^{10}\rm{Be}$ One way to determine the age of an alluvial deposit is to collect a series of samples from a range of depths, ...
4
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2answers
146 views

Relative dating of granite pluton

In selecting a sample for age-dating of a granite pluton, which site is a better site to collect a sample from, the centre, top or side? Why was this site a better choice? Which dating method would ...
4
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1answer
133 views

How many $\ce{^{14}C}$ measurements have been made?

I know that the upper limit of radiocarbon dating is typically about 60,000 years, but how many radiocarbon dates have actually been measured? As of October 2015, how many $^{14}\ce C$ (radiocarbon) ...