Palaeomagnetism shows the pattern of drift of Gondwanaland for the past 600 million years. There seem to have been at least four episodes of rapid drift, with little or no drift in between.

Manny, Diego and Sid -- voiced by Ray Romano, Denis Leary and John Leguizamo -- return for more prehistoric escapades in 'Ice Age: Continental Drift.' Acknowledging its oversight in neglecting to set ...