Imo Formation

Age range: base of the Guzhangian to the top of the Holocene or 500.50000 to 0.00000 Ma
Collections

Oldest occurrences

Time interval Ma Country or state Original ID and collection number
Guzhangian500.5 - 497.0USA (Ohio) (157541)
Darriwilian467.3 - 458.4China (211603 226114)
Aluoja466.0 - 458.0Russian Federation (186396)
Blackriveran - Rocklandian457.3 - 449.6USA (Minnesota) (23392)
Homerian430.5 - 427.4Russian Federation (Gorny Altai) (228315 228316)
Eifelian393.3 - 387.7Australia (New South Wales) (80380)
Middle Givetian383.0 - 380.2France (158152 158162 161387)
Early/Lower Famennian376.1 - 370.6Belgium (135365 135367)
Chadian346.7 - 340.0Algeria (224275)
Brigantian336.0 - 330.9United Kingdom (England) (73399 73400 73401 73402 73416 73417 73418 73419)

Youngest occurrences

Time interval Ma Country or state PBDB collection number
Calabrian1.8 - 0.774Costa Rica (Limon) (79835 79842 79844 79845)
Irvingtonian1.8 - 0.3USA (California) (20155 20319 20442 20522 20528)
Middle Pleistocene0.774 - 0.129Japan (Chiba) (198611)
Middle Pleistocene0.774 - 0.129Japan (190675)
Late/Upper Pleistocene0.129 - 0.0117Japan (169410)
Late/Upper Pleistocene0.129 - 0.0117Japan (Hokkaido) (56376 65401)
Holocene0.0117 - 0.0Brazil (Acre) (217620 217621 217625 217627 217631 217641 217778 217801 217812 217816 217855 217856 217857 217858 217859 217860 217861 217862 217863 217864 217865 217866 217867 217868 217869 217870 217871 217885)
Holocene0.0117 - 0.0Brazil (Rondonia) (217682)
Holocene0.0117 - 0.0Brazil (Rondônia) (217681)
Holocene0.0117 - 0.0Brazil (Amazonas) (217663 217664 217668)