A close-up showing the scale of one of the blocks of Castle Rock Conglomerate that is already displaced Hazards July 10, 2009 Case Study: Rockfall – St. Francis of Assisi, Castle Rock The CGS studied the site of St. Francis of Assisi Church in Castle Rock extensively after a block detached from the upper cliff face in January 1981. The block presented a risk to homes at the base of the slope south of the church, and was subsequently broken up using…