Calvary is an old cinder cone. It started as a fissure from which ash and scoria were ejected, one fragment at a time, for thousands of years, tumbling up and outwards in a family of mortar-shell-like parabolic curves, varying in height and distance depending on the size of each fragment and the direction of the wind. They landed in a wide ring centered on the fissure. As the ring grew in height it naturally spread out into a broad, truncated cone with a central pit gouged out of its top, with the spitting fissure in the bottom of that pit.