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David M. Raup Biography

David M. Raup (April 24, 1933 – July 9, 2015) was a University of Chicago paleontologist. Raup studied the fossil record and the diversity of life on Earth. Raup contributed to the knowledge of extinction events along with his colleague Jack Sepkoski. They suggested that the extinction of dinosaurs 66 mya was part of a cycle of mass extinctions that may have occurred every 26 million years.

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David M. Raup Quotes

Now let me step back from the problem and very generally discuss natural selection and what we know about it. I think it is safe to say that we know for sure that natural selection, as a process, does work. There is a mountain of experimental and observational evidence, much of it predating genetics, which shows that natural selection as a biological process works.

Thinking, Mountain, Steps, Safe, Let, Works

A new theory is guilty until proven innocent, and the pre-existing theory innocent until proven guilty. . . Continental drift was guilty until proven innocent.

Drift, Guilty, Innocent, Science

In the beginning, there were bacteria. . . . [A] nearly universal assumption is that all subsequent life descended from the original life form through a continuous chain of ancestor-descendant pairs. This assumption looks good because all living organisms share biochemical traits. It is conceivable, of course, that life originated more than once on the early earth but that all except one life form died out early, leaving a single lineage as the ancestor of life as we know it. If this did happen, it was the first important species extinction.

Ancestor, Extinction, Important, Leaving, Life, Universal

Perhaps the only thing that saves science from invalid conventional wisdom that becomes effectively permanent is the presence of mavericks in every generation - people who keep challenging convention and thinking up new ideas for the sheer hell of it or from an innate contrariness.

Challenging, Contrariness, Convention, Science, Thinking, Wisdom

The once rather old-fashioned science of paleontology finds itself in a maelstrom of excitement and controversy. Astrophysicists, atmospheric scientists, geochemists, geophysicists, and statisticians are all contributing to the extinction problem. And the general public is taking part through television talk shows, magazine cover stories, newspaper editorials, and even the occasional mention in gossip columns.

Gossip, Extinction, Stories, Astrophysicists, Cover, Geophysicists

The charge that the construction of the geologic scale involves circularity has a certain amount of validity. . . . Thus, the procedure is far from ideal and the geologic ranges are constantly being revised (usually extended) as new occurrences are found.

Circularity, Construction, Found, Occurrences, Range, Usually

We now have a quarter of a million fossil species, but the situation hasn't changed much. . . We have even fewer examples of evolutionary transition than we had in Darwin's time.

Example, Fossils, Quarter, Situation, Transition

There are millions of different species of animals and plants on earth--possibly as many as forty million. But somewhere between five and fifty BILLION species have existed at one time or another. Thus, only about one in a thousand species is still alive--a truly lousy survival record: 99. 9 percent failure!

Animal, Animals, Different, Forty, Plants, Survival

I doubt if there is any single individual within the scientific community who could cope with the full range of [creationist] arguments without the help of an army of consultants in special fields.

Army, Community, Consultants, Doubt, Help

A large number of well-trained scientists outside of evolutionary biology and paleontology have unfortunately gotten the idea that the fossil record is far more Darwinian than it is. This probably comes from the oversimplification inevitable in secondary sources: low-level textbooks semipopular articles, and so on. Also, there is probably some wishful thinking involved. In the years after Darwin, his advocates hoped to find predictable progressions. In general. these have not been found-yet the optimism has died hard and some pure fantasy has crept into textbooks.

Articles, Hard, Idea, Ideas, Numbers, Thinking

It has been argued that dinosaurs did not die out, but just evolved wings and flew away. At a certain level, this reasoning is sound. . . . Birds, as a group, did descend from dinosaurs and. . . all 8,600 species of birds living today carry some inheritance from their reptilian ancestors.

Wings, Bird, Sound, Species, Level

Ironically, we have even fewer examples of evolutionary transitions than we had in Darwin's time.

Evolutionary, Example, Fossils, Ironically, Transition, Transitions

250,000 species of plants and animals recorded and deposited in museums throughout the world did not support the gradual unfolding hoped for by Darwin.

Animal, Museums, Recorded, Support, Unfolding, World

There are about 250,000 different species of fossil plants and animals known. . In spite of this large quantity of information, it is but a tiny fraction of the diversity that [according to the theory] actually lived in the past. There are well over a million species living today and. . [it is] possible to predict how many species ought to be in our fossil record. That number is at least 100 times the number we have found.

According, Animal, Numbers, Past, Plants, Record