Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Connecticut
|Name||West Rock Dolerite (uncertain)|
|Geologic age||Lower Jurassic|
|Original map label||Jwr?|
|Comments||Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins; Same as Jwr|
|Primary rock type||basalt|
|Secondary rock type||gabbro|
|Other rock types|
Igneous > Volcanic > Mafic-volcanic > Basalt (Diabase)Dark-gray to greenish-gray (weathers bright orange to brown), medium- to fine-grained, grading from basalt near contacts to fine-grained gabbro in the interior, generally massive with well-developed columnar jointing, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine.
Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, data format: shapefile, file name: bedrock, downloaded from: http://magic.lib.uconn.edu/cgi-bin/MAGIC_DBsearch2.pl?Geography=37800&Loc=0000 on 9/18/2003, scale 1:50,000.
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 125,000.
|Geographic coverage||New Haven|
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