English: The 2020 National Fossil Day Logo is inspired by the rich diversity of Permian marine fossils found at the Guadalupe Mountains and Glass Mountains of west Texas and New Mexico. The Permian Period (299 to 252 million years ago) represents the last geologic period of the Paleozoic Era, which ended with a massive extinction event at the boundary marking the end of the Permian and the beginning of the Triassic Period and the Mesozoic Era. During this extinction event approximately 96% of marine species and 70% of terrestrial vertebrate species went extinct. However, the Permian rocks and fossils preserved at Guadalupe Mountains National Park predate this extinction event and shows that a rich tropical reef system once occurred in west Texas and southeastern New Mexico approximately 270 million years ago. Guadalupe Mountains National Park was established on September 30th, 1972 and incorporates 86,367 acres near El Paso, Texas. The park’s name comes from the Guadalupe Mountains, which are found in western Texas and southeastern New Mexico, and also contain Carlsbad Cavern National Park. Guadalupe Mountains National Park includes Guadalupe Peak, which at 8749 feet in height is the highest point in the state of Texas, and El Capitan, an important geographical feature for travelers of the Butterfield Overland Mail stagecoach line during the late 1800s. These features of the Guadalupe Mountains are composed primarily of fossil-rich Permian limestones. In fact, there are so many fossils in the mountains that the middle part of the Permian is called the Guadalupian.