[click on image to see a larger one]
Visible light image using UV/IR Cut filter:

Reflected UV image using Baader-U filter (310-390nm) with 365nm UV LED:

Reflected UV image using Baader-U filter (310-390nm) with 365nm UV LED (in bw):

UV stimulated visible Fluorescence image with 420nm Longpass filter:

UV stimulated visible Fluorescence image, 2nd version, with UV-IR Cut filter:

It gets nicely visible that using UV light photography brings out much more details than normal visible light photography and by doing so, enhances the visibility quite a bit.
I have written more about fossils HERE
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos