Spechts Ferry Member

Geology

Formation: Decorah

Lithologies: claystone (1), "shale" (1)

Paleoenvironments: marine indet. (1), carbonate indet. (1)

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)
Blackriveran - Rocklandian457.3 - 449.6USA (Illinois, Iowa) (23454 23621 23795)
Blackriveran - Rocklandian457.3 - 449.6USA (Illinois, Iowa, Wisconsin) (23761)
Rocklandian457.3 - 449.6USA (Iowa) (23203)
Rocklandian457.3 - 449.6USA (Iowa/Wisconsin) (23117)
Rocklandian457.3 - 449.6USA (Minnesota) (23393 167573)
Rocklandian457.3 - 449.6USA (Minnesota, Iowa, Wisconsin, Illinois) (23311)