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Author Topic:   Dating Question For Members
arachnophilia
Member (Idle past 582 days)
Posts: 9069
From: god's waiting room
Joined: 05-21-2004


Message 9 of 77 (610160)
03-26-2011 11:37 PM
Reply to: Message 6 by Buzsaw
03-26-2011 10:38 PM


Re: Related Dating Questions
Buzsaw writes:

From searching, I learned that most fossils consisted of sedimentary rock and were void of original organic matter. This raised the question in my mind as to why the aggregate age of the rock or sand grains in the sediment would not be calculated as the age of the fossil rather than the time the organism was deposited.

If Moose is correct, in that fossils are dated from the time of deposit, why wouldn't that apply to sea shore sand and for that matter, even a house built of stone, some of which had aged fossils in it.

ah. well, i found your problem. you asked a question about sand when you really wanted to know about sandstone. the two are not the same thing.

sedimentary rocks can be dated by the other stuff that collects in it during the sedimentation process -- usually stuff found in the liquid environment that produces it. for relative methods, the fossils and their correlated dates ("index" fossils) can be used, but i know you'll find this circular. the absolute dating method you're looking for potassium-argon dating.

while it can be used to date the source rock as well, potassium also collects during the deposition of the sediment, too. this is particularly easy with glauconite sandstone. so, yeah, ask for what you want to know -- cause you miss stuff when you make intuitive leaps for the sake of argument.

Edited by arachnophilia, : No reason given.


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This message is a reply to:
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