Ur (continent)

Ur

Ur, in the Eoarchean Era[citation needed]
Historical continent
Formed	3.1 Ga
Type	Supercontinent
Today part of	Pilbara Craton Dharwar Craton Singhbhum Craton Kaapvaal Craton Zimbabwe Craton

Ur is a hypothetical supercontinent that formed in the Archean eon around 3.1 billion years ago (Ga). In a reconstruction by Rogers, Ur is half a billion years older than Arctica and, in the early period of its existence, probably the only continent on Earth, making it a supercontinent despite probably being smaller than present-day Australia. In more recent works geologists often refer to both Ur and other proposed Archaean continental assemblages as supercratons. Ur can, nevertheless, be half a billion years younger than Vaalbara, but the concepts of these two early cratonic assemblages are incompatible.^{[citation needed]}