<Tr> <Th> Parent range </Th> <Td> Sapphire Mountains </Td> </Tr> <Tr> <Th> Topo map </Th> <Td> USGS Southeast Missoula </Td> </Tr> <P> Mount Sentinel, originally known as "Mount Woody," is a small mountain located to the east of the University of Montana in Missoula, Mont . At a height of 1,958 feet and an elevation of 5,158 feet (1,572 m), Mount Sentinel also features the hillside letter "M", a large concrete structure 620 feet (189 m) up its western face . </P> <P> The University of Montana first received land on Mount Sentinel in 1902 when the Northern Pacific Railroad Company donated 40 acres at the foot and up the slope of the mountain . The U.S. Congress later turned over many acres of Mount Sentinel so that campus extended up the slope to the crest of the mountain, making the University of Montana the only university in the nation to own a mountain . In 2000, the city of Missoula also purchased 475 acres along the face of Mount Sentinel . </P>

When were the rocks that make up mount sentinel first deposited as sediment