Geologic Resources Division

es in the world in Arches National Park, the world's largest and most colorful collections of petrified wood at Petrified Forest National Park, and over half of the known geysers in the world in Yellowstone National Park. Scientifically important fossil deposits are found in 243 parks, 81 parks contain 4,900 known caves, and another 40 parks have known karst systems. Ninety–seven parks protect 7,500 miles of shoreline, 52 parks contain geothermal systems, 38 parks have volcanoes as a major feature, and 37 have active glacial features. Park museum collections have more than 35,000 geological specimens and nearly 475,000 paleontological specimens.