- Mount St. Helens National Volcanic Monument (Wikipedia)
Mount St. Helens National Volcanic Monument is a U.S. National Monument that includes the area around Mount St. Helens in Cowlitz, Lewis, and Skamania Counties, Washington. It was established by Congress on August 27, 1982, following the 1980 eruption. The 110,000 acre (445 km2) National Volcanic Monument was set aside for research, recreation, and education. Inside the monument, the environment is left to respond naturally to the disturbance. It was the third national monument to be managed by the U.S. Forest Service and is part of the Gifford Pinchot National Forest.
- Neogene (Wikipedia)
The Neogene (/ˈniː.ədʒiːn/ NEE-ə-jeen, informally Upper Tertiary or Late Tertiary) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period 23.03 million years ago (Mya) to the beginning of the present Quaternary Period 2.58 Mya. The Neogene is sub-divided into two epochs, the earlier Miocene and the later Pliocene. Some geologists assert that the Neogene cannot be clearly delineated from the modern geological period, the Quaternary. The term “Neogene” was coined in 1853 by the Austrian palaeontologist Moritz Hörnes (1815–1868).