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EvC Forum ⇒ Science Forums ⇒ Dates and Dating ⇒

Dating by Stratigraphic Position

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Topic: Dating by Stratigraphic Position

NosyNed

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Message 3 of 38 (112142)
06-01-2004 5:02 PM

Reply to: Message 1 by jar
06-01-2004 4:34 PM

Ooooops

The first issue relates to a basic assumption. Does everyone agree that if an object is found in a relative undisturbed site, that the object must be younger that what lies on top of it?

Uh, no I don't

. This isn't the best start is it? LOL

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NosyNed

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Posts: 9004

From: Canada

Joined: 04-04-2003

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Message 9 of 38 (112201)
06-01-2004 7:46 PM

Reply to: Message 8 by 1.61803
06-01-2004 7:28 PM

Undistrubed

So how do we distinguish an undisturbed site from others?

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NosyNed

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Message 14 of 38 (112315)
06-02-2004 1:35 AM

Reply to: Message 12 by Chiroptera
06-01-2004 9:27 PM

mmm maybe

That doesn't sound very convincing. Why wouldn't a bone be worn? Could it wear and then fossilize?

However, let's not get stuck on the fossils. Can we get to a final point on the rock layers themselves then worry about fossils?

This message has been edited by NosyNed, 06-02-2004 12:36 AM

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NosyNed

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Posts: 9004

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Message 19 of 38 (112451)
06-02-2004 3:57 PM

Reply to: Message 18 by jar
06-02-2004 3:41 PM

Layers

OK, back to layers. We agree that an undisturbed higher layer is younger than it's underlying layers. How do I tell if it is undisturbed?

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NosyNed

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Posts: 9004

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Message 23 of 38 (112511)
06-02-2004 10:06 PM

Reply to: Message 21 by Chiroptera
06-02-2004 6:17 PM

The main point

In fact, by tracing the layers over a large area

I think that this is the crux of the matter. Large areas, looking for correlations between layers.

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NosyNed

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Posts: 9004

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Joined: 04-04-2003

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Message 32 of 38 (112552)
06-03-2004 2:21 AM

Reply to: Message 31 by edge
06-02-2004 11:48 PM

So?

If there are chalk bed laid down at the same time is that the corrolation? Or are they chalk that is as similar as the chalk in England and norther france?

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