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Science Forum Index » Anthropology - Paleo Forum » Latest Issue of Science and Telescope -- dating near-Earth s
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| Erik |
 Posted: Sat Feb 17, 2007 8:45 pm |
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Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw |
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| deowll |
| Posted: Sat Feb 17, 2007 10:33 pm |
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"Erik" <socalsw@yahoo.com> wrote in message
news:1171759532.420520.42570@t69g2000cwt.googlegroups.com...
Quote: Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw
This is more an elements than a fossil thing I would think but getting
showered with hard radiation could cause an extinction event. Slow
reproducing, long lived life forms suffer most if I recall right. |
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| Come to Afghanistan! |
| Posted: Sun Feb 18, 2007 4:08 am |
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deowll wrote:
Quote: "Erik" <socalsw@yahoo.com> wrote in message
news:1171759532.420520.42570@t69g2000cwt.googlegroups.com...
Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw
long lived life forms suffer most if I recall right.
just the opposite. mutations rates 10-10k higher in shorter
lived organisms. Think about it. Shorter lived organisms have
less time to live so they must mutate and adapt more quickly.
(I did not say "quicker" because I have yet to bow to the 1980's
neo zoom weavie bastardisations of English which occured during
the Media Induced Mutation in the Gen-X maldam fornax!) |
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| Come to Afghanistan! |
| Posted: Sun Feb 18, 2007 4:18 am |
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Erik wrote:
Quote: Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Its an old idea, but no associations are proved, to my knowledge.
More obvious causes of genetic mutation and extinction have always
captured center stage, but it is worth considering since
its an obvious source with very specific telltale signs, both in
living records and in the rock record. Give researchers time.
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| deowll |
| Posted: Sun Feb 18, 2007 9:47 pm |
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"Come to Afghanistan!" <motel_rentals@rightwing.com> wrote in message
news:45D8098D.EB50B2A0@rightwing.com...
Quote:
deowll wrote:
"Erik" <socalsw@yahoo.com> wrote in message
news:1171759532.420520.42570@t69g2000cwt.googlegroups.com...
Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw
long lived life forms suffer most if I recall right.
just the opposite. mutations rates 10-10k higher in shorter
lived organisms. Think about it. Shorter lived organisms have
less time to live so they must mutate and adapt more quickly.
(I did not say "quicker" because I have yet to bow to the 1980's
neo zoom weavie bastardisations of English which occured during
the Media Induced Mutation in the Gen-X maldam fornax!)
They don't live long enough to collect as many mutations as individuals thus
they are less likely to suffer a negative before they die. They also
reproduce more quickly so any individuals that die are quickly replaced.
Thus the radition is much less of a threat to the species. |
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| John Roth |
| Posted: Mon Feb 19, 2007 3:47 pm |
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On Feb 17, 5:45 pm, "Erik" <soca...@yahoo.com> wrote:
Quote: Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw
The S&T table of contents indicates that it was 2.8 million years ago.
I know of no extinction event at that time.
However, it's in the right time slot for the origin of genus homo. The
earliest fossils that are usually assigned to genus homo turn up
shortly after that.
I doubt if it had anything to do with the matter, though.
John Roth |
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| Erik |
| Posted: Mon Mar 05, 2007 7:14 pm |
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On Feb 19, 11:47 am, "John Roth" <JohnRo...@jhrothjr.com> wrote:
Quote: On Feb 17, 5:45 pm, "Erik" <soca...@yahoo.com> wrote:
Finally having a chance this past week to look at my S&T, I was
fascinated by the article on supernovas and life on Earth. What got
me thinking was the evidence of increased radioactivity at a certain
layer of rock, indicating the date of the last major supernova near
Earth. My question is (hence the cross-post) is if any studies of
hominid fossils (or other fossils) have been able to yield similar
data -- i.e. that have looked at increased radioactivity or other
signs indicating a supernova? Is this even possible with fossils?
Erik
socalsw
The S&T table of contents indicates that it was 2.8 million years ago.
I know of no extinction event at that time.
However, it's in the right time slot for the origin of genus homo. The
earliest fossils that are usually assigned to genus homo turn up
shortly after that.
I doubt if it had anything to do with the matter, though.
John Roth
I may have been a bit unclear in my original post. I am thinking less
of mutations and more about how one might use such data to help date
possible novae or supernovae in conjunction with observationial
astronomy. The type of radioactivity generated would not neccessarily
be enough to cause any harm or mutations. I will admit, however, that
I may have a faulty understanding of radiometric dating.
Erik
socalsw |
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| Lee Olsen |
| Posted: Tue Mar 06, 2007 12:30 am |
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Erik wrote:
Quote: I am thinking less
of mutations and more about how one might use such data to help date
possible novae or supernovae in conjunction with observationial
astronomy. The type of radioactivity generated would not neccessarily
be enough to cause any harm or mutations. I will admit, however, that
I may have a faulty understanding of radiometric dating.
You may be interested in this article in Mammoth Trumpet
http://www.centerfirstamericans.org/mt.php
See 2001 Vol 16 Number 2. Radiocarbon Dating on Trial.
Richard Firestone blames a supernova.
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