The continental drift theory was first hypothesized by Alfred Wegener in the early 1900s. It was poorly received, until the mid-late 1960s when further geological research found supporting evidence. In the 1970s the advent of the global positioning system (GPS) has been able to measure continental drift. The continental drift theory states that all the continents used to be a large ‘supercontinent' 300 million years ago. This theory influenced ecology because it gave rise to many theories of speciation. The most notable is allopatric speciation which arises when a population is separated geographically, and then each evolved into a distinct species.