Carbon Dating Mt St Helens

What are the assumptions that must be enacted while using radion-carbon dating?
I went to the Creation Museum (no bashing please!) and in the intro, they mentioned how that method of dating was innaccurate and that it was based on many assumptions. All it mentioned was that the decay rate was different in the past. Then in a different part of the museum said that this method was used to date rocks from the Most recent Mt. St. Helen’s explosion 300,000 years old. How is that possible?
Emphasis on the second question.
With as little “bashing” as possible here, they are being intentionally dishonest. They are well aware from being told many times by many sources why their claims are bogus and misleading.
Just Google any portion of their claim and you will get numerous rebutals to their claims, many from experts. Do a little research into the expertise of the creationists making the claims, and which side would benefit the most from being dishonest about radiometric dating.
Petrified Wood happens too Quickly for Evolutionists
