OEB 53 Chapter : Origin Study Guide 9
Document Summary
The origin of the species: chapter 9 (on the imperfection of the geological record) In this chapter darwin anticipates and attempts to explain the problems that the geological record presents for his model of descent with modification. The major problems with the fossil record are apparent gaps, sudden appearance, and lack of intermediate forms in the fossil record. Darwin argues that fossilization is a complicated process, and results in the impression of gaps and abrupt appearance, because relatively few species will be preserved in the fossil record. He makes the case that bones and shells, which fossilize best, are rare, as compared to the more abundant soft parts that are not well fossilized.