NeoDarwinism expected a fine gradation of form from one species to the next but the distribution of morphologies is clumpy at virtually all scales. Appeals to gaps in the fossil record don’t solve the problem and now evolutionists are considering more complex explanations for how evolution could have produced such morphological discontinuities. They are also suggesting that the expectation of fine gradations between species may have been driven by Charles Lyell’s promotion of uniformitarianism in geology and by the desire to be physics-like. Darwin’s friend Thomas Huxley warned Darwin about his narrow focus on gradualism. As Douglas Erwinexplains: Read more