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To: Junior
It is fairly obvious when an opinion is unfounded.
So back to the original response. When I say no one knows for sure the earth's age".
It sounds like you are saying that is a very naive response to the question.
1,432 posted on 12/30/2002 6:51:44 AM PST by usastandsunited
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To: usastandsunited
Down to the year, no. However, geologists have a good idea, based upon actual evidence, that the Earth is somewhere between 4 billion and 4.5 billion years old. Absolutely no evidence points to an Earth only a few thousand years old, and any "opinion" that this is the case is obviously unfounded and is to be dismissed out of hand. Note, the geologists base their estimates on actual evidence; Bible thumpers base their "opinions" on faith.
1,433 posted on 12/30/2002 7:03:47 AM PST by Junior
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To: All
Since way back in post 1081, g3k has been asked: HOW OLD IS THE EARTH?. Still no answer, except for dodges, evasions, excuses, and attempts to provoke a flame war (and thus an excuse to have the thread pulled).

It can't be very difficult for someone who has surveyed all Nobel Prize winning work and has declared that it all disproves evolution. An intellect of such sweeping power should be able to give us his answer. HOW OLD IS THE EARTH?.

1,434 posted on 12/30/2002 7:04:45 AM PST by PatrickHenry
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To: usastandsunited
When I say no one knows for sure the earth's age". It sounds like you are saying that is a very naive response to the question.

Several studies by several methods seem to bracket the answer rather tightly. If you know what you're talking about in discussing the age of the earth, you have some awareness of that.

Below is a table of radiometric ages derived from groups of meteorites:

Type Number
Dated
Method Age (billions
of years)

Chondrites (CM, CV, H, L, LL, E) 13 Sm-Nd 4.21 +/- 0.76
Carbonaceous chondrites 4 Rb-Sr 4.37 +/- 0.34
Chondrites (undisturbed H, LL, E) 38 Rb-Sr 4.50 +/- 0.02
Chondrites (H, L, LL, E) 50 Rb-Sr 4.43 +/- 0.04
H Chondrites (undisturbed) 17 Rb-Sr 4.52 +/- 0.04
H Chondrites 15 Rb-Sr 4.59 +/- 0.06
L Chondrites (relatively undisturbed) 6 Rb-Sr 4.44 +/- 0.12
L Chondrites 5 Rb-Sr 4.38 +/- 0.12
LL Chondrites (undisturbed) 13 Rb-Sr 4.49 +/- 0.02
LL Chondrites 10 Rb-Sr 4.46 +/- 0.06
E Chondrites (undisturbed) 8 Rb-Sr 4.51 +/- 0.04
E Chondrites 8 Rb-Sr 4.44 +/- 0.13
Eucrites (polymict) 23 Rb-Sr 4.53 +/- 0.19
Eucrites 11 Rb-Sr 4.44 +/- 0.30
Eucrites 13 Lu-Hf 4.57 +/- 0.19
Diogenites 5 Rb-Sr 4.45 +/- 0.18
Iron (plus iron from St. Severin) 8 Re-Os 4.57 +/- 0.21

After Dalrymple (1991, p. 291); duplicate studies on identical meteorite types omitted.

As shown in the table, there is excellent agreement on about 4.5 billion years, between several meteorites and by several different dating methods. Note that young-Earthers cannot accuse us of selective use of data -- the above table includes a significant fraction of all meteorites on which isotope dating has been attempted. According to Dalrymple (1991, p. 286) , less than 100 meteorites have been subjected to isotope dating, and of those about 70 yield ages with low analytical error.

Further, the oldest age determinations of individual meteorites generally give concordant ages by multiple radiometric means, or multiple tests across different samples. For example:


Meteorite Dated Method Age (billions
of years)

Allende whole rock Ar-Ar 4.52 +/- 0.02

whole rock Ar-Ar 4.53 +/- 0.02

whole rock Ar-Ar 4.48 +/- 0.02

whole rock Ar-Ar 4.55 +/- 0.03

whole rock Ar-Ar 4.55 +/- 0.03

whole rock Ar-Ar 4.57 +/- 0.03

whole rock Ar-Ar 4.50 +/- 0.02

whole rock Ar-Ar 4.56 +/- 0.05

Guarena whole rock Ar-Ar 4.44 +/- 0.06

13 samples Rb-Sr 4.46 +/- 0.08

Shaw whole rock Ar-Ar 4.43 +/- 0.06

whole rock Ar-Ar 4.40 +/- 0.06

whole rock Ar-Ar 4.29 +/- 0.06

Olivenza 18 samples Rb-Sr 4.53 +/- 0.16

whole rock Ar-Ar 4.49 +/- 0.06

Saint Severin 4 samples Sm-Nd 4.55 +/- 0.33

10 samples Rb-Sr 4.51 +/- 0.15

whole rock Ar-Ar 4.43 +/- 0.04

whole rock Ar-Ar 4.38 +/- 0.04

whole rock Ar-Ar 4.42 +/- 0.04

Indarch 9 samples Rb-Sr 4.46 +/- 0.08

12 samples Rb-Sr 4.39 +/- 0.04

Juvinas 5 samples Sm-Nd 4.56 +/- 0.08

5 samples Rb-Sr 4.50 +/- 0.07

Moama 3 samples Sm-Nd 4.46 +/- 0.03

4 samples Sm-Nd 4.52 +/- 0.05

Y-75011 9 samples Rb-Sr 4.50 +/- 0.05

7 samples Sm-Nd 4.52 +/- 0.16

5 samples Rb-Sr 4.46 +/- 0.06

4 samples Sm-Nd 4.52 +/- 0.33

Angra dos Reis 7 samples Sm-Nd 4.55 +/- 0.04

3 samples Sm-Nd 4.56 +/- 0.04

Mundrabrilla silicates Ar-Ar 4.50 +/- 0.06

silicates Ar-Ar 4.57 +/- 0.06

olivine Ar-Ar 4.54 +/- 0.04

plagioclase Ar-Ar 4.50 +/- 0.04

Weekeroo Station 4 samples Rb-Sr 4.39 +/- 0.07

silicates Ar-Ar 4.54 +/- 0.03

After Dalrymple (1991, p. 286); meteorites dated by only a single means omitted.

Also note that the meteorite ages (both when dated mainly by Rb-Sr dating in groups, and by multiple means individually) are in exact agreement with the solar system "model lead age" produced earlier.

The Age of the Earth.

So yes. To claim there's no reason to think one thing versus another is to appear uninformed.

1,436 posted on 12/30/2002 7:10:29 AM PST by VadeRetro
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