Film Archive). Natural features Flowing into the main campus are two branches of Strawberry Creek. The south fork enters a culvert upstream of the recreational complex at the mouth of Strawberry Canyon and passes beneath California Memorial Stadium before appearing again in Faculty Glade. It then runs through the center of the campus before disappearing underground at the west end of campus. The north fork appears just east of University House and runs through the glade north of the Valley Life Sciences Building, the original site of the Campus Arboretum. Trees in the area date from the founding of the university. The campus features numerous wooded areas, including: Founders' Rock, Faculty Glade, Grinnell Natural Area, and the Eucalyptus Grove, which is both the tallest stand of such trees in the world and the tallest stand of hardwood trees in North America. The campus sits on the Hayward Fault, which runs directly through California Memorial Stadium. Student life and traditions The official university mascot is Oski the Bear, who debuted in 1941. Previously, live bear cubs were used as mascots at Memorial Stadium until it was decided in 1940 that a costumed mascot would be a better alternative. Named after the Oski-wow-wow yell, he is cared for by the Oski Committee, whose members have exclusive knowledge of the identity of the costume-wearer. The University of California Marching Band, which has served the university since 1891, performs at every home football game and at select road games as well. A smaller subset of the Cal Band, the Straw Hat Band, performs at basketball games, volleyball games, and other campus and community events. The UC Rally Committee, formed in 1901, is the official guardian of California's Spirit and Traditions. Wearing their traditional blue and gold rugbies, Rally Committee members can be seen at all major sporting and spirit events. Committee members are charged with the maintenance of the six Cal flags, the large California banner overhanging the Memorial Stadium Student Section and Haas Pavilion, the California Victory Cannon, Card Stunts and The Big "C" among other duties. The Rally Committee is also responsible for safekeeping of the Stanford Axe when it is in Cal's possession. The Chairman of the Rally Committee holds the title "Custodian of the Axe" while it is in the committee's care. Overlooking the main Berkeley campus from the foothills in the east, The Big "C" is an important symbol