Decorah Formation
Geology
Group: Galena
Members: unnamed (2), Guttenberg (2), Ion (4), Rhinidictya bed (1), Rhinidictya Beds (1), Spechts Ferry (2)
Lithologies: claystone (4), mudstone (1), "shale" (29), "limestone" (17)
Paleoenvironments: marine indet. (10), carbonate indet. (19), deep subtidal shelf (5), coastal indet. (2)
Age range: Turinian or 457.30000 to 453.80000 Ma
Collections
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Turinian | USA (Missouri) | (175724) | |
Mohawkian | USA (Minnesota) | (167563 167565 167609) | |
Blackriveran | USA (Minnesota) | (167592 167610 167628) | |
Blackriveran - Kirkfieldian | USA (Iowa) | (89042) | |
Blackriveran - Shermanian | USA (Minnesota) | (23295 23298) | |
Blackriveran - Shermanian | USA (Iowa) | (23300) | |
Kirkfieldian | USA (Iowa) | (175936) | |
Rocklandian | USA (Minnesota, Iowa, Wisconsin, Illinois) | (23309 23312 23377) | |
Rocklandian | USA (Iowa) | (164473) | |
Rocklandian | USA (Minnesota) | (154411 154413 167573 172817 195584 219962 219964 219965) | |
Rocklandian | USA (Wisconsin) | (64093) | |
Rocklandian - Kirkfieldian | USA (Minnesota) | (23558 23708) | |
Rocklandian - Shermanian | USA (Minnesota) | (23123 23124 23148 23174 23277 23290 23394 23402 23550) |