词条 | Middleton Basin |
释义 |
The Middleton Basin is a small sedimentary basin, in northeastern Massachusetts, containing Late Triassic and Early Jurassic red beds. Estimated to be 5.7 kilometers long and at most half a kilometer wide, it is one of the smallest basins in the state and is closely associated with the Newbury basins. A normal fault, striking northeast, is exposed on the southeastern margin of the basin, which separates it from surrounding Proterozoic crystalline basement rock. The red beds dip west. The basin is situated at a point where the Burlington mylonite zone and the Bloody Bluff fault fade out and where the Milford-Dedham zone veers north. Mylonite never formed in the area because the young Triassic faults did not produce long-lasting deformation. [1] References1. ^{{cite book |author=Goldsmith, Richard |year=1991|title=Structural and Metamorphic History of Eastern Massachusetts|publisher=USGS|p=H41}} {{Massachusetts-geo-stub}} 2 : Geology of Massachusetts|Natural history of Massachusetts |
随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识,基本涵盖了大多数领域的百科知识,是一部内容自由、开放的电子版国际百科全书。