FALLING ROCK—British Columbia, Southern Selkirks, Mt. Marion. Four climbers were approaching the crest of the ridge of Mt. Marion at about 7,700 feet at 1130 hours on August 3, 1976, and were traversing some moderately steep solid slabs. They were spread out over a distance of about 100 feet vertically and 20 feet horizontally. The third man touched a large rectangular block that was part of a six-inch step in the slabs but was almost imperceptibly cracked about one foot from the step. It was dislodged by the touch. It fell down the slope, touched the back of the fourth man without injury and then gouged the back of his right lower leg. After he was carried to a more comfortable place, one man went for a helicopter, which picked up the injured man at about 2015 hours. (Source: P. W. Wood.)

Analysis. Climbers should remain close together when in areas containing potential rock dislodgement danger. (Source: P. W. Wood.)