seaboard

the eastern seaboard of the United States.

美东部滨区。

Its original rock is sedimented in the environment of active epicontinent-seaboard with basic volcanism, and become khondalite series through the Archean regional high-amphibolite facies metamorphism.

原岩形成于具有山作用的活动大边缘滨-浅环境。经过太古宙的区高角闪岩相变质作用，形成孔兹岩系。