This map is based on the controversial theories of Thomas Burnet whose popular treatise, Telluris Theoria Sacra , focused on the breaking up of "the fountains of the great deep" as the cause of the flood, as described in Genesis 7:11. This map presents the hemispheres, one above the other, and depicts the earth bared of its waters showing the ocean floor in relief. California is an island, there is a single Great Lake, and Australia is partially formed.