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The Middle Devonian Dundee Limestones of Southwestern Ontario accumulated in the Michigan and Appalachian Basins, with deposition in part being controlled by the proximity to the Findlay and Algonquin arches. Six lithofacies were recognized in the Dundee Formation during detailed core and outcrop studies . Stratigraphic relations indicate that, prior to deposition of Dundee carbonates, a major regression exposed underlying Detroit River sediments adjacent to the arches. Subsequent transgression deposited reworked sands and shallow shelf, bioclastic limestones in most areas of the adjoining basins while in westernmost regions of the Appalachian Basin Columbus Formation sediments were accumulating adjacent to the Findlay Arch. Transgression became interrupted during middle Dundee time and a thick unit of lagoonal muds was deposited in the Appalachian Basin. A regionally well-developed firmground capping these mudstones indicates that a significant episode of non-deposition ensued. The equivalents of these muds in the Michigan Basin are pulses of coarse, reworked grainstones and rudstones indicating that substrates there were shallower and above wave base. Evidence of subsequent renewed transgression is preserved as middle to outer shelf moderately fossiliferous mudstones and wackestones overlying shallow shelf facies. Many friends, too many to mention here, made my stay at McMaster an enjoyable one. Mac wouldn't have been the same without the numerous challenges and imaginative adventures in which these people were always willing to participate. Francois Brissette, Bruce Willmer, Randy Meecham, Stu Miller, Steve Beneteau and other members of the Rockbusters Football and Aureoles Baseball teams provided continuous entertainment both on and off of the sports field. Their dedication and light-hearted approach allowed me to maintain a respectable degree of sanity throughout my studies. Finally, I would like to thank my family for their continual assistance, encouragement and support provided during the pursuit of my academic endeavours. Thesis Master of Science (MSc)

This study combines the fields of communication studies and psychology in order to determine the relationship between personality type, academic background, and social media content. Ten participants from each of McMaster University’s seven undergraduate faculties completed a Myers-Briggs Type Indicator (MBTI) to determine their personality type, and submitted 10 personally written status updates or comments from the social media platforms of Twitter or Facebook. The Content Analysis of Verbatim Explanation (CAVE) method was used to analyze 630 social media content to determine overall positive or negative explanatory style. The dominant personality types at McMaster University as determined by the 70 participants are: INFP, ENFJ, and ISTJ. In type preference it was found that 68% of the participants prefer the attitude of Introversion (I), 70% prefer the perceptive function of Intuition (N), 54.3% prefer the judging function of Thinking (T), and 61.4% prefer the orientation of Judging (J). The following personality preferences were found to be correlated with the CAVE’s explanatory dichotomies: Internal/External with Sensing (S) / Judging (J), Stable/Unstable with Extraversion (E) / Sensing, Global/Specific with Sensing/Thinking, and Controllable/Uncontrollable with Sensing. Of the 630 submitted social media content, 68.4% of them were found describing positive events. It was found that 92.1% of the social media content contained an optimistic explanatory style. These findings strongly suggest that the majority of content written and uploaded on social media is positive and that personality type plays a minor role in content and explanations produced. It is concluded from these results that social media is an inherently positive medium for university students. The primary reason for this is believed to be a result of social media being an immensely public sphere forcing all individuals, regardless of personality type, to engage in higher levels of self-monitoring.