The bones of a coyote that died of injury or age while seeking succor on the warmth of a geyser cone lie in a pool of supersaturated mineral water that is refreshed with each eruption of the geyser%2C Fuller explains. %22The bones provided armatures on which%2C in the course of years%2C siliceous sinter was deposited to form an ever thicker encrustation. Mineral deposits eventually closed over the watery window where the bones lay.%22 Photo by Steven Fuller