(n.) The doctrine that the geological changes in the earth's crust have been caused by the sudden action of violent physical causes; -- opposed to the doctrine of uniformism.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). catastrophism. Retrieved September 22, 2026, from http://smartdefine.org/catastrophism/definitions/1985274 |
| Chicago | Webster's. 2011. "catastrophism" http://smartdefine.org/catastrophism/definitions/1985274 (accessed September 22, 2026). |
| Harvard | Webster's 2011, catastrophism, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/catastrophism/definitions/1985274>. |
| MLA | Webster's. "catastrophism" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/catastrophism/definitions/1985274> |