Glowing spider fossils prompt breakthrough study of how they were preserved at Aix-en-Provence.

A geologic formation near Aix-en-Provence, France, is renowned as one of the world’s most important treasure troves of Cenozoic Era fossil species. Scientists have been uncovering exceptionally well-preserved fossilized plants and animals there since the late 1700s.

“Most life doesn’t become a fossil.” —