supercontinent

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Russia stretches across much of the north of the supercontinent of Eurasia.
俄罗斯横跨欧亚大陆北部的大部分地区。
The very first supercontinent was called Vaalbara and it started forming more than 3.6 billion years ago.
真正意义上的第一个超大陆名叫瓦尔巴拉，它从36亿年前就开始形成了。
Many of us are familiar with the idea that the world's continents once fit snuggly together into one huge single supercontinent called Pangea.
我们之中的许多人熟知一个概念：世界的几片大陆曾经紧紧靠在一起，组成了一个超大陆。我们称之为泛古陆。

IGCP-597: Amalgamation and Breakup Pangaea: the Type Example of the Supercontinent Cycle.
UNESCO: EARTH SCIENCES FOR SOCIETY
Another benefit of this find is that it provides further evidence that dinosaurs evolved in the southern portion of Pangaea, the supercontinent that existed in the Triassic period.
FORBES: Scientists Discover The Earliest Known Dinosaur

a great landmass thought to have existed in the geological past and to have split into smaller landmasses, which drifted and formed the present continents