Macroevolution

The theory of Phyletic Gradualism states that evolution takes place slowly and constantly through time.

The theory of punctuated holds that the change we can see is evolutionarily minor and that speciation occurs only in response to major crises or genetic events. The majority of time, species exist in relative stasis, changing very little, until a crisis or major genetic event occurs and they undergo rapid change.

Eldredge and Gould state that their theory is supported by the fossil record, which shows major evolutionary changes separated by periods of relative stability.

Darwin supported the theory of gradualism. He felt that evolutionary change was slow and constant.