Decorah Shale Formation
Geology
Group: Galena
Members: unnamed (21)
Lithologies: claystone (1), "shale" (18), "limestone" (8)
Paleoenvironments: marine indet. (4), carbonate indet. (14), deep subtidal shelf (1), coastal indet. (2)
Age range: Mohawkian or 457.30000 to 451.00000 Ma
Collections
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Mohawkian | USA (Minnesota) | (167563 167565 167609) | |
Blackriveran | USA (Minnesota) | (167592 167610 167628) | |
Blackriveran - Kirkfieldian | USA (Iowa) | (89042) | |
Rocklandian | USA (Minnesota, Iowa, Wisconsin, Illinois) | (23309 23312 23377) | |
Rocklandian - Kirkfieldian | USA (Minnesota) | (23558 23708) | |
Rocklandian - Shermanian | USA (Minnesota) | (23123 23124 23148 23174 23277 23290 23394 23402 23550) |