Imo Formation
Members: unnamed (35)
Lithologies: not reported (123), "siliciclastic" (44), claystone (65), mudstone (50), "shale" (63), siltstone (182), sandstone (132), gravel (8), conglomerate (32), marl (1), wackestone (8), packstone (6), grainstone (23), "reef rocks" (2), rudstone (2), bafflestone (1), framestone (1), "limestone" (130), dolomite (1), "carbonate" (1), amber (2), peat (2)
Paleoenvironments: marine indet. (157), terrestrial indet. (264), carbonate indet. (5), shallow subtidal indet. (17), open shallow subtidal (11), lagoonal/restricted shallow subtidal (1), sand shoal (3), reef, buildup or bioherm (68), perireef or subreef (50), offshore shelf (1), marginal marine indet. (3), coastal indet. (32), estuary/bay (1), lagoonal (27), deltaic indet. (13), shoreface (4), transition zone/lower shoreface (19), offshore (23), submarine fan (7), deep-water indet. (34), fluvial indet. (4), alluvial fan (3), "channel" (1), "floodplain" (8), fluvial-lacustrine indet. (10), fluvial-deltaic indet. (6), lacustrine - large (1), pond (2), lacustrine deltaic indet. (1)
Oldest occurrences | |||
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Guzhangian | USA (Ohio) | (157541) | |
Darriwilian | China | (211603 226114) | |
Aluoja | Russian Federation | (186396) | |
Blackriveran - Rocklandian | USA (Minnesota) | (23392) | |
Homerian | Russian Federation (Gorny Altai) | (228315 228316) | |
Eifelian | Australia (New South Wales) | (80380) | |
Middle Givetian | France | (158152 158162 161387) | |
Early/Lower Famennian | Belgium | (135365 135367) | |
Chadian | Algeria | (224275) | |
Brigantian | United Kingdom (England) | (73399 73400 73401 73402 73416 73417 73418 73419) | |
Youngest occurrences |
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Time interval | Ma | Country or state | PBDB collection number |
Calabrian | Costa Rica (Limon) | (79835 79842 79844 79845) | |
Irvingtonian | USA (California) | (20155 20319 20442 20522 20528) | |
Middle Pleistocene | Japan (Chiba) | (198611) | |
Middle Pleistocene | Japan | (190675) | |
Late/Upper Pleistocene | Japan | (169410) | |
Late/Upper Pleistocene | Japan (Hokkaido) | (56376 65401) | |
Holocene | Brazil (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) | |
Holocene | Brazil (Rondonia) | (217682) | |
Holocene | Brazil (Rondônia) | (217681) | |
Holocene | Brazil (Amazonas) | (217663 217664 217668) |