Figure 1. Orthide diversity curves for the six major plate/terrane groups and the Precordillera. Baltica Major = Baltica + Scania, Laurentia Major = Core Laurentia + Greenland plate + Svalbard + Cordilleran accreted terranes, - Mexican Terrane, Avalonia Major = American and European Avalonian sections, European massifs = Armorica, Bohemia, Apulia and Iberia, Siberia = Siberia including the Kolyma Block and Taimyr but excluding the Kazakh terranes, Core Gondwana = South America and Africa.