Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Ages for Muscovite at Grafton, Grafton Co., New Hampshire, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 332.09Ma - 320.09Ma 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-00981	332.09	320.09	Muscovite			3281	Ruggles Mine, Grafton, Grafton Co., New Hampshire, USA	USGS-Rb-Sr	USGS-Rb-Sr

Direct 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-00981	332.09	320.09	Muscovite			3281	Ruggles Mine, Grafton, Grafton Co., New Hampshire, 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-00982	320.91	320.91				3281	Ruggles Mine, Grafton, Grafton Co., New Hampshire, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-U-Th-Pb-00254_207_206	160	0				3281	Ruggles Mine, Grafton, Grafton Co., New Hampshire, USA	USGS-U-Th-Pb	USGS-U-Th-Pb