| State | Connecticut |
|---|---|
| Name | Portland Arkose |
| Geologic age | Lower Jurassic |
| Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone > Arkosereddish-brown to maroon micaceous arkose
Sedimentary > Clastic > Siltstone
Minor
Sedimentary > Clastic > ConglomerateGrades eastward into coarse conglomerate (fanglomerate).
Sedimentary > Clastic > Mudstone > Shalered to black fissile silty shale
|
| Comments | Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins. Part of Newark Supergroup (Upper Triassic and Lower Jurassic) |
| References | Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000. |
| NGMDB product | |
| Counties | Hartford - Litchfield - Middlesex - New Haven - Tolland |