|Name||New Haven Arkose plus Buttress Dolerite|
|Geologic age||Upper Triassic; possibly Lower Jurassic at top plus Middle? Jurassic|
Sedimentary > Clastic > Sandstone > ArkoseNew Haven Arkose - Red, pink, and gray coarse-grained, locally conglomeratic, poorly sorted and indurated arkose.
Igneous > Volcanic > Mafic-volcanic > Basalt (Diabase)Buttress Dolerite (Middle? Jurassic) - Dark-gray to greenish-gray (weathers brown or gray), medium- to fine-grained, commonly porphyritic, generally massive with well-developed columnar jointing, grading from basalt near contacts to fine-grained gabbro in the interior, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine.
Sedimentary > Clastic > SandstoneNew Haven Arkose - fine-grained feldspathic clayey sandstone.
Sedimentary > Clastic > SiltstoneNew Haven Arkose - locally shaly siltstone
|Comments||Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins; Units are described seperately on printed map; combined in digital map.|
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.