Karl Korsch identifies in Marx’s work what he calls “the principle of historical specification,” the way in which “Marx comprehends all things social in terms of a definite historical epoch.” This work is concerned with this idea and its instantiation in contemporary social theory. With this paper I hope to show how the principle of historical specification has been interpreted within the Birmingham tradition of cultural studies, paying specific attention to (1) the form of historical time implicit in the concept of a “conjuncture,” and (2) the logic of historical periodization that follows from a “conjuncturalist” approach to historical research. I argue that a conception of plural temporality is central to the mode of historical analysis associated with the Center for Contemporary Cultural Studies.