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Author Topic:   Soft Tissue Surviving 65 Million Years?
mark24
Member (Idle past 3701 days)
Posts: 3857
From: UK
Joined: 12-01-2001


Message 53 of 77 (510357)
05-30-2009 8:43 AM
Reply to: Message 49 by slevesque
05-30-2009 2:59 AM


sleveque,

Isn't sandstone dated with index fossils ? If not, what dating method is used on this type of strata ?

The strata are dated by looking at the next oldest & youngest igneous rocks in the geologic column above & below the strata to be dated. Say we want to date "C", & it turns out that at the bottom of "B" & the top of "D" contained datable igneous rocks:

Strata A
Strata B Igneous rock dates to 100 mya
Strata C
Strata D Igneous rock dates to 110 mya
Strata E

Then "C" must be 100 to 110 mya. If around the world a particularly abundant fossil consistently dates in this age bracket & never anywhere else, then we can reasonably assume any strata containing that fossil is 100-110 mya.

Mark

Edited by mark24, : No reason given.


There are 10 kinds of people in this world; those that understand binary, & those that don't

This message is a reply to:
 Message 49 by slevesque, posted 05-30-2009 2:59 AM slevesque has responded

Replies to this message:
 Message 55 by slevesque, posted 05-31-2009 2:20 AM mark24 has responded

  
mark24
Member (Idle past 3701 days)
Posts: 3857
From: UK
Joined: 12-01-2001


Message 56 of 77 (510445)
05-31-2009 9:00 AM
Reply to: Message 55 by slevesque
05-31-2009 2:20 AM


slevesque,

But in this particular case, how was it dated ?

No idea, you'll probebly have to read the original paper, but for the record, why is it important?

Mark


There are 10 kinds of people in this world; those that understand binary, & those that don't

This message is a reply to:
 Message 55 by slevesque, posted 05-31-2009 2:20 AM slevesque has not yet responded

  
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