The early cenozoic contains an abrupt climate change event that is important as a potential modern analog of greenhouse warming. Sedimentary rocks associated with the warm/rainy conditions of the tropics are found at high latitudes, such as coals, bauxite (source of aluminum ore-heavily weathered silicates), and evaporites. We begin with the bighorn basin, and the study of the fossil leaves: leaf size and shape is indicative of average temperatures. Watch the youtube interview with scott wing, a paleobotanist at the smithsonian, and see his fieldwork locality in the bighorn basin: http://www. youtube. com/watch?nr=1&v=c9bfvkkqioa. Now let"s travel up to ellesmere island in the high arctic, and learn what the petm and early eocene environment was like through the study of the canadian museum of. Finally, let"s head to florida and learn what the petm and early eocene environment was like through the study of the florida museum of natural history: http://www. youtube. com/watch?v=pysc6623k7i&feature=related.