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Questions tagged [dating]

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2
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2answers
29 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 ...
0
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0answers
38 views

Is the precision of radiocarbon dating method getting worse before 2000 BCE?

But physicist R. Brown of Andrews University claims that this radiocarbon enter preformatted text here`dating method is highly inaccurate. After a ten-year study, he concludes that radioactive ...
6
votes
1answer
84 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
votes
1answer
41 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
134 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
votes
1answer
62 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
62 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 ...
15
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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 ...
6
votes
1answer
128 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
110 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 ...
8
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1answer
1k 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 ...
4
votes
1answer
188 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 ...
0
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0answers
190 views

chronological ordering of sequence for relative dating

Can anyone help me with this? Enter from in chronological order, from oldest to most recent, the letter corresponding to processes A through H below. Use upper case letters and insert one letter per ...
4
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1answer
86 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 ...
5
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0answers
69 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
votes
2answers
93 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
votes
1answer
132 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) ...