Breaking out all the fancy words, is it my birthday? ;)
Sorry, just used to seeing a stream of shifted number keys flow from your fingers.
Now, to topic:
Spectroscopic analysis could add corroborative data as well, of course.
That would depend on the state of the fossils. If the organisms, or their structure, has been lithified by the surrounding material, then spectroscopically they'll be hard to differentiate from said material.