Ages for Opal at DeKalb Co., Georgia, USA

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

• 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-03779	292.86	276.86				71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03780	292.86	276.86	Microcline			71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03781	309.24	293.24				71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03782	308.24	294.24				71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03791	292.86	276.86				71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03792	292.86	276.86				71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03805	295.94	265.94				71292	North Georgia Quarry (Crossley Quarry), DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-03806	301.92	261.92	Muscovite			71292	North Georgia Quarry (Crossley Quarry), DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr