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" ... Do trends in the species richness of chelonians over the Mesozoic correspond with any sort of climatic patterns? In the first global study of turtle diversity through time, Nicholson et al. sought to find this out by collecting all known records of fossil turtle occurrences across the globe. It is important in studies such as this one that care is taken to remove bias in the sampling record. Paleontologists have searched disproportionately hard in certain areas of the globe to find fossils, and hardly looked in others. When drawing conclusions about the raw number of species present in the fossil record, researchers need to be certain that these numbers are in some way corrected or rarefied before they are compared to climate records. ... "