This thesis examines a bayhead bar in the western end of the Lake Ontario Basin with the purpose of determining the dominant factors in the process-response model. From former field examination of the bar, and through the collection of deep drill cores, an attempt has been made to establish former processes which acted in the area of the present bar, Presently, field study, especially through the collecting of drill cores, sediment samples and wind data and by logging of wave data and longshore movement, has led to an attempt to establish the effect of present processes acting on the bar. / Thesis / Bachelor of Arts (BA)