Catastrophism and uniformitarianism are two contrasting theories of geological evolution. Catastrophism proposes that geological change is driven by sudden and violent events, such as floods, earthquakes, and volcanic eruptions. Uniformitarianism, on the other hand, proposes that geological change is driven by the same gradual processes that we see operating today, such as erosion and deposition.
I'd like you to meet an important scientist named Georges Cuvier. As a zoologist and naturalist, he helped establish our current understanding of the history of Earth. Cuvier formed the basic methods of biostratigraphy by studying sedimentary rock layers and fossil succession. He began the popular field of comparative anatomy by studying the bones of modern elephants and ancient mammoths. He named the first flying reptile, the pterodactyl, and he even has five living animals named after him.
|Catastrophism vs Uniformitarianism: Theories of Geological Evolution
Cuvier contributed a lot to our knowledge about the Earth. But the funny thing is, Cuvier also believed that Earth was only a few million years old! That's a big deal, considering we know now that the Earth is over four billion years old. How could a guy who knew so much about the Earth, who studied rocks and fossils and contributed so much to science, be so drastically wrong about the age of our planet?
As we'll see, it had a lot to do with Cuvier's upbringing and the scientific atmosphere that existed in his time. Let's look deeper into our geologic theories and see how they have changed over the last few hundred years.
Catastrophism has a long history in Western thought, dating back to the ancient Greeks. However, it was not until the 17th century that it became the dominant view in geology. This was due in part to the work of Georges Cuvier, a French naturalist who studied the fossils found in the sedimentary rocks of Paris. Cuvier was struck by the fact that many of these fossils were of animals that were no longer alive. He concluded that these animals had been killed in a series of catastrophic events, such as floods.
Cuvier's ideas were influential, and catastrophism became the prevailing view in geology until the early 19th century. However, there were a number of problems with catastrophism. First, it was difficult to explain how catastrophic events could have occurred frequently enough to account for the diversity of geological features on Earth. Second, catastrophism could not explain the gradual changes in the fossil record.
Catastrophism is the theory that Earth's features are mostly accounted for by violent, large-scale events that occurred in a relatively short amount of time. So, a species that went extinct was probably killed off by a giant natural disaster. An impressive mountain range was probably formed by worldwide earthquakes and eruptions.
Cuvier and other scientists believed that most major features of the land we see today were established a very long time ago by very dramatic events. These events would not at all resemble the small-scale natural disasters we experience in our time. The drama was over, immortalized in religious texts, never again to be seen on such a humongous scale.