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〕 | lat_d = 40 | lat_m = 40 | lat_s = 20 | lat_NS = N | long_d = 95 | long_m = 41 | long_s = 18 | long_EW = W | area_unit = acre | area_imperial = 1990 | area_round = 0 | area_note = | established = 1926 | management_body = Iowa Department of Natural Resources | map = Iowa Locator Map.PNG | map_caption = Location of Waubonsie State Park in Iowa | map_locator = Iowa | website = (Waubonsie State Park ) }} Waubonsie State Park is a state park of Iowa, US, located in the Loess Hills region. It is named for Chief Wabaunsee of Potawatomi tribe. Waubonsie State Park is located in the unique Loess Hills, a landform found only along the Missouri River in Iowa and Missouri. As glaciers melted 14,000 to 28,000 years ago, the Missouri River became a major channel for huge volumes of water and sediment during the summer. In winter, the volume of the meltwater was reduced, leaving the deposited sediments exposed to the wind. These sediments of silt, clay and very fine sand particles called "loess," were then carried by strong westerly winds and deposited when these winds encountered the steep slopes of the east valley wall. There are several distinctive features of loess hills topography. Because of the fine texture of the soil, deep, steep-sided and very narrow ridge tops have been eroded in the hills. Small, step-like terraces called "cat steps" resulting from repeated slipping of the soil can be seen on many west-facing slopes. Since the soil drains rapidly, nearly vertical cuts can be made in the soil without erosion. The unique topography of the park resembles the "badlands" of the west and harbors plants like the yucca which are normally found in more arid climates. ==Nearby towns== Sidney, Iowa is north and holds Iowa's largest continuous outdoor rodeo, held during July. Hamburg is south of the park. Nebraska City is west across the Missouri River in Nebraska and is the home of Julius Sterling Morton, founder of Arbor Day. His home is now a museum at Arbor Lodge State Historical Park and Arboretum in Nebraska. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Waubonsie State Park」の詳細全文を読む スポンサード リンク
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