Galena Group

Geology

Formations: unnamed (1), Cummingsville (2), Decorah (4), Decorah Shale (2), Decorah shale (1), Dubuque (5), Dunleith (40), Glenwood, Platteville, Decorah (1), Guttenberg (9), Ion (10), Spechts Ferry (2), Wise Lake (9)

Lithologies: claystone (3), mudstone (1), "shale" (22), wackestone (5), "limestone" (66), dolomite (5), "carbonate" (1)

Paleoenvironments: marine indet. (3), carbonate indet. (73), sand shoal (1), deep subtidal shelf (5), offshore indet. (1)

Age range: Edenian or 451.00000 to 450.20000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Middle Ordovician - Late/Upper Ordovician470.0 - 443.8USA (Wisconsin, Illinois, Iowa) (23553)
Blackriveran - Kirkfieldian457.3 - 449.6USA (Iowa) (89042)
Blackriveran - Shermanian457.3 - 449.6USA (Minnesota) (23298)
Kirkfieldian457.3 - 449.6USA (Illinois, Iowa, Wisconsin) (23766 23767)
Kirkfieldian457.3 - 449.6USA (Iowa) (23214 23215)
Kirkfieldian457.3 - 449.6USA (Illinois, Iowa) (23460 23465 23623 23644 23797 23798)
Kirkfieldian457.3 - 449.6USA (Minnesota, Iowa) (23379)
Rocklandian457.3 - 449.6USA (Iowa/Wisconsin) (23116 23117)
Rocklandian457.3 - 449.6USA (Minnesota) (219962 219964 219965)
Rocklandian457.3 - 449.6USA (Wisconsin) (81283 90362)
Rocklandian457.3 - 449.6USA (Illinois) (211925)
Rocklandian457.3 - 449.6USA (Iowa) (23203 23207 164473)
Rocklandian - Kirkfieldian457.3 - 449.6USA (Illinois, Iowa) (23457 23622 23796)
Rocklandian - Kirkfieldian457.3 - 449.6USA (Illinois, Iowa, Wisconsin) (23762)
Rocklandian - Shermanian457.3 - 449.6USA (Wisconsin) (90360)
Rocklandian - Shermanian457.3 - 449.6USA (Minnesota) (23277 23550)
Shermanian457.3 - 449.6USA (Wisconsin) (90366)
Shermanian457.3 - 449.6USA (Illinois, Iowa) (23470 23471 23472 23477 23481 23486 23651 23653 23656 23659 23664 23667 23668 23670 23799 23800 23801 23802 23803 23804 23805 23806)
Shermanian457.3 - 449.6USA (Illinois) (195615)
Shermanian457.3 - 449.6USA (Iowa, Illinois) (23469 23474)
Shermanian457.3 - 449.6USA (Illinois, Iowa, Wisconsin) (23768 23769 23770 23771 23773 23775 23776 23777)
Shermanian457.3 - 449.6USA (Iowa) (23217 23219 23230 23231 23232 169537)
Katian453.0 - 445.2USA (Iowa) (138446)
Edenian451.0 - 450.2USA (Illinois, Iowa) (23490 23492 23494 23678 23679 23680 23807 23808 23809)
Edenian451.0 - 450.2USA (Iowa) (23233 23234)
Edenian451.0 - 450.2USA (Illinois, Iowa, Wisconsin) (23778 23779 23780)