Trent Thomas

Abstract Geological records indicate that the surface of ancient Mars harboured substantial volumes of liquid water, a resource gradually diminished by processes such as the chemical alteration of crustal materials by hydration and atmospheric escape. However, how a relatively warm climate existed on early Mars to support liquid water under a fainter young Sun is debated.

Abstract At least two global “Snowball Earth” glaciations occurred during the Neoproterozoic Era (1000-538.8 million years ago). Post-glacial surface environments during this time are recorded in cap carbonates: layers of limestone or dolostone that directly overlie glacial deposits.

Abstract The black-tailed prairie dog, Cynomys ludovicianus, was described by the early naturalists and explorers as inhabiting an area ranging from southern Canada to northern Mexico. Although their habitat varies in environmental extremes, little is known of the physiological responses of this species. Most investigations concerning them have dealt with their possible role as disease vectors, their effects on agriculture and livestock management, and the structure of their social organization.