milankovitch's work on the trajectory of poles was well accepted only by köppen's associates, because most of the scientific community was skeptical about wegener and milankovic's new theories. later, in the 1950s and 1960s, development of the new scientific discipline in geophysics known as palaeomagnetism led to the key evidence on the basis of studying the records of earth's magnetic field in rocks over geological time. paleomagnetic evidence, both reversals and polar wandering data, led the revival of the theories of continental drift and its transformation into plate tectonics in the 1960s and 1970s. unlike milankovic's linear trajectory of poles, palaeomagnetism reconstructed the path of the poles over geological history to show the nonlinear trajectory.