Phosphatic Fossilization

Phosphatic fossilization has occurred in unusual circumstances to preserve some extremely high-resolution microfossils in which careful preparation can even reveal preserved cellular structures. Such microscopic fossils are only visible under the scanning electron microscope.

Read more about Phosphatic Fossilization:  How It Happens, Phosphatic Preservation in Burgess Shale-type Fossils, Phosphate-only Fossils