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Author Topic:   Dating by Stratigraphic Position
edge
Member (Idle past 1706 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 31 of 38 (112530)
06-02-2004 11:48 PM
Reply to: Message 29 by Chiroptera
06-02-2004 11:02 PM


quote:
Some do - for a period in time (actually there were at least two periods) all the continents were joined together, so the continents were connected together.
This reminds me of something a YEC said on another board recently. It was something to the effect that there are chalk beds in Australia that correlate with the Cretaceous chalk of western Europe. Do you have any information on this? I have looked at my correlation charts and can find no such thing. Maybe it's time to go googling...

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Replies to this message:
 Message 32 by NosyNed, posted 06-03-2004 2:21 AM edge has replied

  
NosyNed
Member
Posts: 8996
From: Canada
Joined: 04-04-2003


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?

This message is a reply to:
 Message 31 by edge, posted 06-02-2004 11:48 PM edge has replied

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 Message 34 by edge, posted 06-03-2004 9:12 PM NosyNed has not replied

  
Chiroptera
Inactive Member


Message 33 of 38 (112666)
06-03-2004 3:44 PM
Reply to: Message 32 by NosyNed
06-03-2004 2:21 AM


Re: So?
Interesting question, Ned. What do we mean by "correlation"? I guess I'm thinking in terms of 18th century (pre-Darwin!) geology (practiced by Christians!). Certain fossils always occurred in the same order in the stratigraphic record, no matter which country you were looking at. It came to be realized that what they were seeing is that very distinctive life existed at different epochs in earth's history. It was then hypothesized that if you saw the same fossils in two strata in two widely separated places, those strata were laid down at the same time. (This hypothesis was confirmed, of course, by radiometric dating.)
To answer a very much earlier question, Ned, I would say that since organic bone is a very different material than a mineralized fossil, it should be easy to tell whether a fossil was eroded out of the original material and transported after fossilization. But, then, I am not a geologist.

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 Message 32 by NosyNed, posted 06-03-2004 2:21 AM NosyNed has not replied

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edge
Member (Idle past 1706 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 34 of 38 (112690)
06-03-2004 9:12 PM
Reply to: Message 32 by NosyNed
06-03-2004 2:21 AM


Re: So?
quote:
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?
Yes. The is the "Chalk." I expect it has some fossil similarities, but many differences (such as thickness) as well, from other Cretaceous chalk beds.
Sure, they correlate, but are they the same continuous deposit? Not many would say so.

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edge
Member (Idle past 1706 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 35 of 38 (112691)
06-03-2004 9:16 PM
Reply to: Message 33 by Chiroptera
06-03-2004 3:44 PM


Re: So?
quote:
To answer a very much earlier question, Ned, I would say that since organic bone is a very different material than a mineralized fossil, it should be easy to tell whether a fossil was eroded out of the original material and transported after fossilization. But, then, I am not a geologist.
It would certainly be possible to have transported fossils that look pristine, but usually the process of erosion and transport is quite destructive of rock materials compared to the depositional environment of fossil remains.

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 Message 33 by Chiroptera, posted 06-03-2004 3:44 PM Chiroptera has not replied

  
MarkAustin
Member (Idle past 3815 days)
Posts: 122
From: London., UK
Joined: 05-23-2003


Message 36 of 38 (133543)
08-13-2004 9:51 AM


William "strata" Smith
I'm going to sail close to the wind of posting bare links here, but I've just found this site.
It's about the above-named William Smith, who created the first ever large scale geological map of England, Wales and part of Scotland.
It's got scans of the whole map, and detailed, printable scans of each of the sections (the whole thing in reality is 6ft by 9ft). All done c1800 bu observation, correlation and meticulous draughtmanship.
There's been a book published recently "The Map that Changed the World" by Simon Winchester. From the reviews I've seen (not yet read it) it's very good.

For Whigs admit no force but argument.

Replies to this message:
 Message 37 by NosyNed, posted 08-13-2004 11:15 AM MarkAustin has not replied
 Message 38 by Coragyps, posted 08-13-2004 12:25 PM MarkAustin has not replied

  
NosyNed
Member
Posts: 8996
From: Canada
Joined: 04-04-2003


Message 37 of 38 (133550)
08-13-2004 11:15 AM
Reply to: Message 36 by MarkAustin
08-13-2004 9:51 AM


Re: William "strata" Smith
I read the book a couple of years ago. I'm not sure if I kept it through my move though. It is very readable and interesting.

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Coragyps
Member (Idle past 734 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 38 of 38 (133576)
08-13-2004 12:25 PM
Reply to: Message 36 by MarkAustin
08-13-2004 9:51 AM


Re: William "strata" Smith
I saw the actual map (well, one of the originals) in London last year. Mighty nice work.
I've also read the book - a good read, but S J Gould himself said in a review that it's not historically accurate.

This message is a reply to:
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