There is a big difference between raidometric dating and carbon dating, and before considering this as a topic I suggest you read the existing threads in the Dates and Dating forum. You might want to begin with this one and then look at this one.
If, after you've read through them you still have questions post a reply here And I'll consider setting you up with someone who can walk you through dating issues.
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Science can only measure radioactivity by general measurement yearly. Whos to say that during the last several millions of years past back to and before the extinction of the dinosaurs as to the year by year, decade to decade, century to century, radioactivity that has transpired that there is any way to accurately date any fossil from previous ages? Is it all not a general science as to the radioactive amounts received from age to age? I am confused and bewildered. Does not also plant life and it's foilage also play a part in radioactivity dating? Do not weather climates and such things matter?
I think you should go to the threads that have discussed a lot of dating issues. When you have read them all then you may have more well-formed questions.
This one is the third continuation of an extensive topic on dating. It was bumped to bring it to your attention. It links back to the previous topics. If you honestly want to learn something I think the time spent reviewing all the posts will help you.
What one such as myself would need to know concerning other than old trees just how carbon dating works and if there are any scientists who disagree that carbon dating is an accurate means for dating fossils.