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
Turinian457.3 - 453.8USA (Missouri) (175724)
Mohawkian457.3 - 451.0USA (Minnesota) (167563 167565 167609)
Blackriveran457.3 - 449.6USA (Minnesota) (167592 167610 167628)
Blackriveran - Kirkfieldian457.3 - 449.6USA (Iowa) (89042)
Blackriveran - Shermanian457.3 - 449.6USA (Minnesota) (23295 23298)
Blackriveran - Shermanian457.3 - 449.6USA (Iowa) (23300)
Kirkfieldian457.3 - 449.6USA (Iowa) (175936)
Rocklandian457.3 - 449.6USA (Minnesota, Iowa, Wisconsin, Illinois) (23309 23312 23377)
Rocklandian457.3 - 449.6USA (Iowa) (164473)
Rocklandian457.3 - 449.6USA (Minnesota) (154411 154413 167573 172817 195584 219962 219964 219965)
Rocklandian457.3 - 449.6USA (Wisconsin) (64093)
Rocklandian - Kirkfieldian457.3 - 449.6USA (Minnesota) (23558 23708)
Rocklandian - Shermanian457.3 - 449.6USA (Minnesota) (23123 23124 23148 23174 23277 23290 23394 23402 23550)