Wallace begins his stories of the men who dug up the mammal fossils in an unlikely place: beneath Paris.
But the preparators have only scratched the surface of the museum's collection of more than 250,000 mammal fossils.
These mammal fossils are the first found on the continent from the period roughly 30 million to 50 million years ago.
Several small mammal fossils have been recorded in the intertrappean beds, however larger mammals are mostly unknown.
Darwin's reputation was being made by the giant mammal fossils.
The collection of mammal fossils that resulted is now held at the Natural History Museum.
You can trip across a dinosaur skeleton, but how do you find tiny mammal fossils?
Early mammal fossils found in Wales show the transition from reptiles.
As the overall brain size increases in subsequent mammal fossils, the olfactory bulb scales up faster.
The park is known for producing myriad mammal fossils dating from the last glacial period.