In 1912, a German astronomer named Alfred Wegener proposed that the continents around the Indian Ocean were physically joined and moved apart. This theory explained fossil connection and the existence of glacial deposits. Fossils also found in different continents helped scientists and geologists determine the connection between continents. Mountain belts marked the boundaries of moving plates, which showed in which direction the different continents drifted. Fossils and mountain belts were helpful in deciding where to move the continents since the geologists could see how they were placed together.
Fossils and mountain belts can give the geologist ideas about the history of the certain continents and what are the animals that stayed and died in that place.
Both can also help the geologists to identify if the particular continent is a safe place to live on because the animals of a long time ago stayed on that place. So maybe the place is safe from water high tide and is not a moving plates.
The fossil symbols and mountain belts provided clues as to where and how the continents were connected together before they had moved. The mountain belts showed scientists the direction those plates moved and the fossils indicated that similar dinosaurs or animals lived together in the same area.