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 Grunerite at Essex Co., Massachusetts, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 457Ma - 350.45Ma 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-U-Th-Pb-00150_207_206	457	445	Zircon			47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-Rb-Sr-01308	350.45	350.45				206529	Blackburn Circle Locality, Gloucester, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr

Locality age

Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Dated Locality ID	Dated Locality	Ref	Ref ID
Alexandra-0417	262	246		22345	Lynnfield, Essex Co., Massachusetts, USA	Zartman et al. (1970)	GSAB81_3359
Alexandra-0418	268	252		22345	Lynnfield, Essex Co., Massachusetts, USA	Zartman et al. (1970)	GSAB81_3359
Alexandra-0419	369	349		22345	Lynnfield, Essex Co., Massachusetts, USA	Zartman et al. (1970)	GSAB81_3359
Bradley_2012_072	396	388	Zircon	15757	Salem, Essex Co., Massachusetts, USA	McCauley and Bradley (2014)	CM52_183
USGS-Rb-Sr-00934	431.82	419.82		47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00935	431.82	419.82		47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00936	431.82	419.82		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00937	431.82	419.82		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00938	431.82	419.82		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00947	383.26	335.26		33588	Kallenberg Quarry (Robin Rock Quarry), Lynnfield, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00950	474.27	428.27		22346	Nahant, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00951	503.6	461.6		22346	Nahant, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01308	350.45	350.45		206529	Blackburn Circle Locality, Gloucester, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01309	364.15	364.15		206529	Blackburn Circle Locality, Gloucester, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
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
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
USGS-U-Th-Pb-00150_206_238	426	418	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00150_207_206	457	445	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00150_207_235	431	423	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb