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Natural Bridge Park near Natural Bridge, Alabama, is park in Winston County, Alabama, that has been open since 1954.〔〔 The current owners are Jim and Barbara Denton. The park includes picnic accommodations, an artesian well which supplies drinking fountains, a gift shop featuring hand-crafted items, 27 varieties of fern, a variety of hemlock which dates back to the Ice Age and a 30 minute nature trail. The Natural Bridge formation is 60 ft (18.3 m) high, long, and composed of sandstone and iron ore.〔 Alisa Beckwith, "Natural Bridge History", 2002 (''see below:'' References). 〕〔 Ettractions.com, "Natural Bridge of Alabama", 2008 (''see below:'' References). 〕〔 "Natural Bridge, Alabama (Cities)", 2008, Online Highways, webpage: ( OHwy-naturalb ). 〕 This bridge is the longest natural bridge east of the Rocky Mountains in North America. Downhill from the natural bridge is an outcropping of rock, presenting the image of a large American Indian head, in the right profile view, similar to that of an old American Indian Head nickel (''see photo''). The stone image is just over high. As of 2015, admission cost $3.50 for adults.〔 Because of insurance concerns, visitors are not allowed to walk over the bridge, but instead, they view it while walking underneath.〔 The park is open from 8:00 A.M. until sunset seven days a week. ==History== The natural bridge formation is said by geologists to date back about 200 million years.〔 It was formed by water erosion of the weaker sandstone away from the stronger stone bridge spans,〔 creating an erosion feature: natural-bridge.〔 "Britannica Online Service :: Search", Britannica Online, 2009, webpage: (EB-n6 ). 〕 The park itself opened in 1954 to the public.〔 It has long been known that the Creek Indians lived in this area, and they probably used the bridge-cave enclosure for shelter.〔 Downhill from the bridge is the image of an Indian stone head; the origin of this formation is unknown. This location was formerly known as "Lodi." 〔 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「Natural Bridge Park」の詳細全文を読む スポンサード リンク
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