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 Andover, Essex Co., Massachusetts, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 242.03Ma - 230.03Ma 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-06239	242.03	230.03	Muscovite			33585	I-93/Dascomb Rd. Area, Andover, Essex Co., Massachusetts, 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-06239	242.03	230.03	Muscovite			33585	I-93/Dascomb Rd. Area, Andover, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06241	242.03	230.03	Muscovite			33585	I-93/Dascomb Rd. Area, Andover, Essex Co., Massachusetts, 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-06237	990	918				33585	I-93/Dascomb Rd. Area, Andover, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06238	398	382	Microcline			33585	I-93/Dascomb Rd. Area, Andover, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr