The noun PUNCTUATED EQUILIBRIUM has 1 sense: 1. a theory of evolution holding that evolutionary change in the fossil record came in fits and starts rather than in a steady process of slow change Familiarity information: PUNCTUATED EQUILIBRIUM used as a noun is very rare.
APA citation style: Historic American Buildings Survey, C. (1933) Stone House, Fort Ann, Washington County, NY. Documentation Compiled After. [Pdf] Retrieved from the Library of Congress, https://www.loc.gov/item/ny1153/.
Boundary Changes. 1  15 January 1831: Cook County was created from Putnam County by an act of the Illinois State Legislature as the 54th county established in Illinois. The unincorporated Fort Dearborn settlement at the mouth of the Chicago River became the new county's seat.