 The results of paleontology have also contributed to the development of evolutionary theory.In 1944 George Gaylord Simpson published "Tempo and Mode in Evolution", which used quantitative analysis to show that the fossil record was consistent with the branching, non-directional, patterns predicted by the advocates of evolution driven by natural selection and genetic drift rather than the linear trends predicted by earlier advocates of neo-Lamarckism and orthogenesis.This integrated paleontology into the modern evolutionary synthesis.