Whistler Mountain

Whistler Mountain
The peak of Whistler Mountain as seen in the summer of 2007. The chairlift pictured is the Peak Chair.
Highest point
Elevation	2,181 m (7,156 ft)
Prominence	471 m (1,545 ft)
Coordinates	50°03′33″N 122°57′25″W / 50.05917°N 122.95694°W / 50.05917; -122.95694
Geography
Location	British Columbia, Canada
Parent range	Fitzsimmons Range
Topo map	NTS 92J/02
Climbing
Easiest route	Ski lifts

Whistler Mountain is a mountain in the Fitzsimmons Range of the Pacific Ranges of the Coast Mountains, located on the northwestern edge of Garibaldi Provincial Park. It is the location of the Whistler-Blackcomb ski resort and the town of Whistler, British Columbia.

The original name of the mountain was London Mountain, named after a mining claim in the area. The locality was called Alta Lake before the creation of the Resort Municipality of Whistler in the 1970s, but the mountain's name had already been changed in 1965 as the associations with London's bad weather were deemed to be bad for advertising purposes. With the advent of the ski resort in the late 1960s the name was changed to "Whistler" to represent the whistling calls of the marmots, which are also known as "whistlers", that live in the alpine areas of the mountain.

Because of the mountain's proximity to Garibaldi Provincial Park, ski lifts are regularly used to quickly access the alpine, and ski tour into the park. The summit is home to the Whistler Peak chair, and this makes it one of the most traveled summits in BC.

The mountain forms part of a major ski and snowboard resort.

Whistler Mountain contains shale that originated as mud on the seafloor of a former ocean. This same shale formation forms rocks in other locations throughout southwestern British Columbia. The most common rocks that comprise Whistler Mountain are andesite and dacite lava flows. These lava flows and the associated shale form part of a rock assemblage called the Gambier Group. This geologic group was created within a shallow underwater basin about 100 million years ago during the Early Cretaceous period. Granular material, such as clay, sand and silt, was carried into the ancient ocean by rivers that existed during the Cretaceous period. As Cretaceous rivers continuously sent granular material into the former ocean, it was deposited yearly to eventually form layers of sedimentary material. Once the sedimentary material was compressed, it created the shale that now forms portions of Whistler Mountain. The andesite and dacite lava flows were deposited when volcanic eruptions created a series of volcanic islands and produced lava flows in the ancient ocean.