Ages for Chalcanthite at Dickinson Co., Michigan, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 1977.38Ma - 1677.02Ma at this locality

• Age range from children

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  USGS-Rb-Sr-00914	1977.38	1977.38	Muscovite			11628	Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00958	1677.02	1677.02				11628	Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr

• Locality age

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  USGS-Rb-Sr-00902	1536.87	1536.87				123853	Caspian Construction Company Quarry, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00903	1615.19	1615.19				123853	Caspian Construction Company Quarry, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00912	1556.45	1556.45				16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00913	1703.29	1703.29	Muscovite			16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00914	1977.38	1977.38	Muscovite			11628	Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00915	1507.51	1507.51				16267	Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-00958	1677.02	1677.02				11628	Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA	USGS-Rb-Sr	USGS-Rb-Sr