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EvC Forum ⇒ Science Forums ⇒ Big Bang and Cosmology ⇒

The Light Time Problem

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Author Topic:   The Light Time Problem
Dredge
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Posts: 2850
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Message 258 of 278 (899224)
10-10-2022 8:44 PM 		Reply to: Message 36 by dwise1
04-16-2022 4:01 PM

dwise1 writes:
​
Radiometric dating on rock is how long ago it solidified from being molten.
Radiometric dating cannot be performed on sedimentary rock since it is ground down and recycled older rock, so radiometric dating would just get the age of bit of old rock tested. However, we can tell which layers are older than others by the order in which they are stacked. We can also establish dates for layers from igneous intrusions which bracket them in. Therefore we can determine the age of a particular layer.
But the sedimentary rock could be much younger than the surrounding igneous rock.
​
A flood could leave a sedimentary layer-cum-rock around some igneous rocks millions-billions of years after said igneous rocks were formed.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 261 of 278 (899313)
10-11-2022 8:15 PM 		Reply to: Message 259 by ringo
10-10-2022 10:12 PM

ringo writes:
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How do you figure a sedimentary layer managed to sneak UNDER an older igneous layer?
Between the sedimentary layer that contains a fossil and the igneous layer below could be hundreds of meters of other sedimentary rock layers ... which means that fossil-layer could have formed a very long time after the igneous layer.
​
But I guess general geological patterns emerge, which is where index fossils come into play.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 264 of 278 (899324)
10-11-2022 11:05 PM 		Reply to: Message 263 by dwise1
10-11-2022 10:42 PM

Believe it or not, I'm not an expert in geology or atomic dating, so thank you for the information.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 266 of 278 (899381)
10-12-2022 10:09 PM 		Reply to: Message 265 by dwise1
10-11-2022 11:42 PM

dwise1 writes:
​
Since sedimentary layers (of which I was seeing a lot) consists of older rock that had been ground up and recycled, exactly how are they dated?
​
I mean, if you date them directly, then you should get a much older age because they consist of much older rock, right?
Right. Furthermore, I imagine sedimentary rock could contain a mish-mash of particles of vastly varying ages - for example, some particles could be only thousands of years old while other particles could be billions of years old.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 269 of 278 (899394)
10-13-2022 1:49 AM 		Reply to: Message 267 by AZPaul3
10-12-2022 10:21 PM

AZPaul3 writes:
​
So now that you know you are wrong about the particle mix how does this change things?
I don't know⁶.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 271 of 278 (899396)
10-13-2022 3:12 AM 		Reply to: Message 270 by dwise1
10-13-2022 2:01 AM

Thanx for the information. Very interesting.
​
No YEC claim will be forthcoming.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 272 of 278 (899397)
10-13-2022 3:13 AM 		Reply to: Message 268 by Tanypteryx
10-12-2022 10:30 PM

Okay ... thank you. It's all rather fascinating.
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Dredge
Member (Idle past 92 days)
Posts: 2850
From: Australia
Joined: 09-06-2016

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Message 274 of 278 (899405)
10-13-2022 6:16 AM 		Reply to: Message 273 by dwise1
10-13-2022 3:28 AM

When I become a grown-up I might be a geologist.
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