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Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

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the blue beetle
User ID: 654799

United Kingdom
7/4/2009 9:43 AM
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Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?	Quote
The Coelacanth is a lobed fin fish that was found off the coast of Madagascar and is exactly the same as the lobed fin fishes found in 325-410 million year old rock. This is still used as a index fossil for determining how old a rock layer is. How do you know that the rock is 300MY old or 10 years old if the Coelacanth is still alive today?

Anonymous Coward
User ID: 717960

United States
7/4/2009 9:44 AM

Re: Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

The Coelacanth is a lobed fin fish that was found off the coast of Madagascar and is exactly the same as the lobed fin fishes found in 325-410 million year old rock. This is still used as a index fossil for determining how old a rock layer is. How do you know that the rock is 300MY old or 10 years old if the Coelacanth is still alive today?

Quoting: the blue beetle 654799

bsflag

They dont date the earth by fish fossils, they date the earth by rocks, and carbon dating and such

Anonymous Coward
User ID: 654799 (OP)

United Kingdom
7/4/2009 9:48 AM

Re: Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

The Coelacanth is a lobed fin fish that was found off the coast of Madagascar and is exactly the same as the lobed fin fishes found in 325-410 million year old rock. This is still used as a index fossil for determining how old a rock layer is. How do you know that the rock is 300MY old or 10 years old if the Coelacanth is still alive today?

bsflag

bsflag

They dont date the earth by fish fossils, they date the earth by rocks, and carbon dating and such

Quoting: Anonymous Coward 717960

Rocks are part of Earth.Tell us why they us a still living fish to date the rocks then....waiting.

NoMoreCages
User ID: 694401

United States
7/4/2009 9:52 AM

Re: Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

The Coelacanth is a lobed fin fish that was found off the coast of Madagascar and is exactly the same as the lobed fin fishes found in 325-410 million year old rock. This is still used as a index fossil for determining how old a rock layer is. How do you know that the rock is 300MY old or 10 years old if the Coelacanth is still alive today?

Quoting: the blue beetle 654799

ok, you're right, that proves the earth is 6000 yrs old.

wizkid

wizkid

"The question is not, can they reason? Nor, can they talk? But can they suffer?" - Bentham

Anonymous Coward
User ID: 654799 (OP)

United Kingdom
7/4/2009 5:58 PM

Re: Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

The Coelacanth is a lobed fin fish that was found off the coast of Madagascar and is exactly the same as the lobed fin fishes found in 325-410 million year old rock. This is still used as a index fossil for determining how old a rock layer is. How do you know that the rock is 300MY old or 10 years old if the Coelacanth is still alive today?

ok, you're right, that proves the earth is 6000 yrs old.

wizkid

wizkid

Quoting: NoMoreCages

Just admit you do not know.

Anonymous Coward
User ID: 487397

United States
7/4/2009 7:10 PM

Re: Why do they use a fish fossil to date the age of the Earth when that fish is still alive today?

are you looking for an actual answer?
If you are...
They date it by the layers in the rocks in which the fossil was found. They know when the fish 'showed up'. They know it by how long it takes for the layers of sediment in a body of water to go from mud to rock and voila - that is how much time has passed.
If you can't wrap your mind around that. Imagine tree rings. There's a tree in your mom's back yard. 1 ring is formed per year, in the 12 ring is the head of a nail you used to put a sign up for your lemonade stand when you were a kid. 30 years later the tree is cut down and you can see the nail....

Look - it's not rocket science, it's counting.

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