Chester, Hampden Co., Massachusetts, USA
|Latitude & Longitude (WGS84):||42° 16' 45'' North , 72° 58' 45'' West|
|Latitude & Longitude (decimal):||42.2791666667, -72.9791666667|
The town of Chester was chartered as Murrayfield in 1765, and incorporated as Chester in 1783.
Mineral ListMineral list contains entries from the region specified including sub-localities
43 valid minerals. 1 (TL) - type locality of valid minerals.
Rock Types RecordedEntries shown in red are rocks recorded for this region.
Rock list contains entries from the region specified including sub-localities
This information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This data will improve over time as more accurate maps and data sets are added.
|Ordovician - Neoproterozoic443.8 - 1000 Ma||Neoproterozoic-Ordovician sedimentary|
|Middle Ordovician - Tremadocian458.4 - 485.4 Ma||Moretown Formation|
Part of Rowe-Hawley Zone (Ordovician and Older Rocks) Early Ordovician age from zircons (479+/-8 Ma) constrains the age of the previously undated Moretown Formation to Early Ordovician or older. Moretown had been interpreted as Middle Ordovician based on correlations with the Beauceville Formation of southern Quebec and the Missisquoi Formation of VT (Karabinos and Williamson, 1994) per MA005.
|Mesoproterozoic1000 - 1600 Ma||Mesoproterozoic intrusive and metamorphic terranes|
Intrusive and metamorphic terranes
Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.
References for regional geology:
Data provided by Macrostrat.org
Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .
USGS compilers. State geologic map data. State Maps.
Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.