|A reconstruction of Pangaea or the supercontinent said to have existed 200 million years ago, based on fossil evidence, geometrical fit, and sea floor spreading data.|
In 1697, Robert Hooke, based on his previous 1664 earth axial tilt change theory of fossil layers, stated, in response recent reports of discoveries of remains of unknown or strangely located mammas, e.g. Siberian mammoth, Kentish hippopotami, Norfolk elephants, and a Roman ocean-going vessel buried in a Swiss mountain, that Ireland and America might have been joined previously:
“Ask yourselves whether the latitudes of places might have been changes, whether Ireland and America might not have been formerly joined, whether the bottom of the sea might have been dry land and what is now dry land might not have been sea.”— Robert Hooke (1697), "Lecture", Jun 2 
In 1910, Alfred Wegener, based on sea shell studies, similar to Hooke, conceived the theory that all continents formerly were joined. In 1912, Wegener went on an expedition to find evidence of fossil plant overlap between fitting continents.
Wegener published his findings in his The Origin of the continents (1912) and The Origin of Continents and Oceans (1915), arguing therein that all continents used to be joined as one super continent, which he called “Urkontinent” (German), or “original content”, aka supercontinent, in modern terms.  In 1920, Wegener referred to the supercontinent as the “Pangaea of the carboninferous”, after which the term Pangaea became the assumed name of the supercontinent.
1. (a) Hooke, Robert. (1697). “Lecture”, Jun 2; in: Posthumous Works (pgs. 438-41). Royal Society Journal Book, Volume Nine. Publisher.
(b) Inwood, Stephen. (2003). The Man Who Knew Too Much: the Strange and Inventive Life of Robert Hooke 1653-1703 (pg. 432). Pan MacMillan.
2. Beech, Martin. (2014). The Pendulum Paradigm: Variations on a Theme and the Measure of Heaven and Earth (pg. 135). Universal Publishers.
● Pangaea – Wikipedia.