Figure 22. Sampling and the European record of squamate diversity. The Grande Coupure and Eocene/Oligocene boundary are basically the boundary between standard levels MP 20 and MP 21 (MP = Mammifères Paléogène). Solid yellow line is number of localities; solid (dashed) red line is maximum (minimum) number of taxa per level. The number of fossiliferous localities for each level was compiled from Schmidt-Kittler (1987). Data on squamate diversity come from Rage and Augé (1993); "maximum" number of taxa includes questionable occurrences excluded from the "minimum," following these authors.