Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ientshrub.html

Thanks for any help!

Barbara Bush never tells her age.


Routerider wrote in message
...
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.


http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

Routerider schreef
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

+ + +
Actually the article says that they are going to try carbon-dating a bush
that has already died, but that likely was the clone-mother(?) of a bush
that is still there. Carbon dating does not have a particularly good track
record when compared to dendrochronology. The bush may be quite old, but if
they are going to find out how old seems uncertain.
PvR

Routerider schreef
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

+ + +
Actually the article says that they are going to try carbon-dating a bush
that has already died, but that likely was the clone-mother(?) of a bush
that is still there. Carbon dating does not have a particularly good track
record when compared to dendrochronology. The bush may be quite old, but if
they are going to find out how old seems uncertain.
PvR

Routerider schreef
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

+ + +
Actually the article says that they are going to try carbon-dating a bush
that has already died, but that likely was the clone-mother(?) of a bush
that is still there. Carbon dating does not have a particularly good track
record when compared to dendrochronology. The bush may be quite old, but if
they are going to find out how old seems uncertain.
PvR

Routerider schreef
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

+ + +
Actually the article says that they are going to try carbon-dating a bush
that has already died, but that likely was the clone-mother(?) of a bush
that is still there. Carbon dating does not have a particularly good track
record when compared to dendrochronology. The bush may be quite old, but if
they are going to find out how old seems uncertain.
PvR

Routerider schreef
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ncientshrub.ht
ml

Thanks for any help!

+ + +
Actually the article says that they are going to try carbon-dating a bush
that has already died, but that likely was the clone-mother(?) of a bush
that is still there. Carbon dating does not have a particularly good track
record when compared to dendrochronology. The bush may be quite old, but if
they are going to find out how old seems uncertain.
PvR

Oldest Bush?

Is Shrub's grand-dad still alive?

In article ,
"Routerider" wrote:
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ientshrub.html

Thanks for any help!

[ Sorry. Couldn't help myself. ]


Cheers, Phred.

--
LID

Oldest Bush?

Is Shrub's grand-dad still alive?

In article ,
"Routerider" wrote:
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ientshrub.html

Thanks for any help!

[ Sorry. Couldn't help myself. ]


Cheers, Phred.

--
LID

"Routerider" wrote in message ...
Does anyone know how old this bush is? The article states that the bush
will be dated but it only states the approximated age.

http://www.signonsandiego.com/news/s...ientshrub.html

Thanks for any help!

Probably they tested it and found that it didn't break the record so
there was no reason to publish a followup. Even ring counting of trees
might underestimate the age of some trees. Redwoods (Sequoia
sempervirens) can sprout from the stump so a particular redwood clone
could be older than the ring count would indicate.

A single quaking aspen (Populus tremuloides) clone can spread via root
suckers to cover 100 acres or more. One quaking aspen clone in Utah
named 'Pando' has been estimated to be 80,000 years old.
http://www.nps.gov/brca/quaking_aspen.html

Mitton and Grant (1996) stated that a quaking aspen clone can exceed a
million years in age. 'Pando' has been considered the most massive
living organism. It might be the oldest plant as well.

Reference

Mitton, J.B. and Grant, M.C. 1996. Genetic variation and natural
history of quaking aspen. BioScience 46:25-31.

David Hershey schreef
Probably they tested it and found that it didn't break the record so
there was no reason to publish a followup. Even ring counting of trees
might underestimate the age of some trees.

+ + +
Well, to be exact, ring counting is of very limited use. A tree does not
have to make a ring every year, or on the other hand, does not have to
restrict itself to one ring per year. There is also the matter of pieces of
wood from a plant that has been dead for awhile.
PvR

David Hershey schreef
Probably they tested it and found that it didn't break the record so
there was no reason to publish a followup. Even ring counting of trees
might underestimate the age of some trees.

+ + +
Well, to be exact, ring counting is of very limited use. A tree does not
have to make a ring every year, or on the other hand, does not have to
restrict itself to one ring per year. There is also the matter of pieces of
wood from a plant that has been dead for awhile.
PvR

David Hershey schreef
Probably they tested it and found that it didn't break the record so
there was no reason to publish a followup. Even ring counting of trees
might underestimate the age of some trees.

+ + +
Well, to be exact, ring counting is of very limited use. A tree does not
have to make a ring every year, or on the other hand, does not have to
restrict itself to one ring per year. There is also the matter of pieces of
wood from a plant that has been dead for awhile.
PvR

"P van Rijckevorsel" wrote in message .. .
David Hershey schreef
Probably they tested it and found that it didn't break the record so
there was no reason to publish a followup. Even ring counting of trees
might underestimate the age of some trees.

+ + +
Well, to be exact, ring counting is of very limited use. A tree does not
have to make a ring every year, or on the other hand, does not have to
restrict itself to one ring per year. There is also the matter of pieces of
wood from a plant that has been dead for awhile.
PvR

So, how accurate are ring counts for the bristlecone pines? Would you
estimate ring counts are within say 1% or 5% of the actual age? Or are
they less accurate?

The Guinness Book of World Records reports that the 'Prometheus'
bristlecone pine had 4,867 rings when it was cut down. So should
Guinness report a range for the age, such as 4,876 plus or minus 5%?

David Hershey schreef
So, how accurate are ring counts for the bristlecone pines? Would you
estimate ring counts are within say 1% or 5% of the actual age? Or are
they less accurate?

The Guinness Book of World Records reports that the 'Prometheus'
bristlecone pine had 4,867 rings when it was cut down. So should
Guinness report a range for the age, such as 4,876 plus or minus 5%?

+ + +
I don't know how it is for bristlecones, but I assume such high profile
cases would be very accurate. Dendrochronology does not really count rings
but studies patterns of growth rings. In a good year a tree will make a good
ring, in a bad year a narrow one. This means certain time periods result in
recognisable patterns: five good years, one bad year, then one good year,
two bad years, one good year, etc. Such patterns can be matched from one
tree to the other, finally resulting in great accuracy. This also means that
trees three hundred years dead can be matched against living trees on the
one hand and trees six hundred years dead on the other hand. The final
accuracy depends on sampling size, tree species (oak being the most easy):
also results are for a limited area only, or rather a certain pattern will
be most reliable in the area where the sampling took place, and will fade
with distance.

Here in the Netherlands, there is a reliable series for oak going back to
the last Ice Age, which means that an oak beam from a building can sometimes
be dated accurately: "this oak was felled in 1248 AD". If a piece of oak was
from the Baltics, this accuracy changes. For other species than oak work is
ongoing, with varying results.
PvR