<P> Pangaea or Pangea (/ pænˈdʒiːə /) was a supercontinent that existed during the late Paleozoic and early Mesozoic eras . It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago . In contrast to the present Earth and its distribution of continental mass, much of Pangaea was in the southern hemisphere and surrounded by a superocean, Panthalassa . Pangaea was the most recent supercontinent to have existed and the first to be reconstructed by geologists . </P> <P> The name "Pangaea / Pangea" is derived from Ancient Greek pan (πᾶν, "all, entire, whole") and Gaia (Γαῖα, "Mother Earth, land"). The concept that the continents once formed a continuous land mass was first proposed by Alfred Wegener, the originator of the scientific theory of continental drift, in his 1912 publication The Origin of Continents (Die Entstehung der Kontinente). He expanded upon his hypothesis in his 1915 book The Origin of Continents and Oceans (Die Entstehung der Kontinente und Ozeane), in which he postulated that, before breaking up and drifting to their present locations, all the continents had formed a single supercontinent that he called the "Urkontinent". </P> <P> The name "Pangea" occurs in the 1920 edition of Die Entstehung der Kontinente und Ozeane, but only once, when Wegener refers to the ancient supercontinent as "the Pangaea of the Carboniferous". Wegener used the Germanized form "Pangäa", but the name entered German and English scientific literature (in 1922 and 1926, respectively) in the Latinized form "Pangaea" (of the Greek "Pangaia"), especially due to a symposium of the American Association of Petroleum Geologists in November 1926 . </P> <P> The forming of supercontinents and their breaking up appears to have been cyclical through Earth's history . There may have been many others before Pangaea . The fourth - last supercontinent, called Columbia or Nuna, appears to have assembled in the period 2.0--1.8 Ga . Columbia / Nuna broke up and the next supercontinent, Rodinia, formed from the accretion and assembly of its fragments . Rodinia lasted from about 1.1 billion years ago (Ga) until about 750 million years ago, but its exact configuration and geodynamic history are not nearly as well understood as those of the later supercontinents, Pannotia and Pangaea . </P>

In which era did the supercontinent pangea break up