© Stuart Ford
Gastropoda: 541 mya – present
^
541
485.4
443.8
419.2
358.9
298.9
251.902
201.3
145
66
23.03
2.58
(mya) million years ago
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
Quaternary