Ages for Sillimanite at Worcester, Worcester Co., Massachusetts, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 379Ma - 342.14Ma 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-00877	372.14	342.14				15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-06279	379	365				15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-06280	379	365				15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-06281	379	365				15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-06282	379	365				15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr