The Monument is a hoodoo in Cassiar Land District of the Northern Interior of British Columbia, Canada.[1] It lies on the southwestern side of Hoodoo Mountain, a flat-topped stratovolcano in the Northern Cordilleran Volcanic Province.[2] This light grey, needle-like rock formation has an elevation of about 1,100 m (3,600 ft) and rises more than 100 m (330 ft) high, gradually decreasing in diameter to a very sharp point.[1][2] It is slightly oval in cross-section and stands out against the volcanic rocks comprising Hoodoo Mountain.[1]
The Monument contains horizontal columnar jointing and is the eroded remains of a volcanic vent that was probably active between 40,000–30,000 years ago.[1][2][3] However, the amount of lava supplied by The Monument was probably small compared to the main vents now buried beneath Hoodoo's ice cap.[1] It was fed by a dike that intrudes Slide Canyon on the southwestern side of Hoodoo Mountain.[2][3] The surface of The Monument peels off like the layers of an onion, resulting in the creation of a light grey talus deposit at its base.[1][2] The Monument has been described as a lava spine or a volcanic neck.[1][3]
The Monument is a local name that has not been officially approved by the Geographical Names Board of Canada.[1][3]