All fossils are hard to determine when the animal was actually alive. fossils are very hard to interpret because of how old they are. They date back to millions of years. This makes it so hard to determine a date in history when the fossil is from. The bones of the animals get so badly damaged by rain and dirt, that after a few thousand years its almost impossible to even make out what the bone is. So can you imagine how hard it is to date a fossil of an animal that millions of years ago?
http://www.thedarwinpapers.com/oldsite/number5/darwin5.htm
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