 William Boyd (I) (qv) and Clark Gable (qv), during the making of  the film (11 October 1930), narrowly escaped serious injury from  falling rock after two tons of explosives went off with considerably  more force than planned in Dinosaur Canyon, some 70 miles northwest  of Flagstaff, Arizona. While Boyd and Gable were 200 feet from the  blast, rocks and boulders rained down between where they were  standing. Not so lucky were a number of technicians, some 15 of whom  were taken to hospitals in Flagstaff and Tuba City, and director  Howard Higgin (qv), who suffered a broken ankle and various cuts.  The female lead, Helen Twelvetrees (qv), had already returned to  Los Angeles, as most of the principal photography was completed.  Dynamite and black powder had been placed in the face of a 400