Roughly 55 million years ago the world underwent a climatic change from the warm temperatures of the Eocene to the cooler, more arid environment of the Oligocene. This Eocene/Oligocene boundary is associated with an extinction/origination event in Europe known as theGrande Coupure, whereby new immigrants from Asia replaced most of the old Eocene genera from Europe. But was such an extinction a worldwide event? One group has now looked at the fossil record from Central Asia, and has found that a similar extinction event —called the Mongolian remodelling by the authors —did indeed occur.