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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Chatfield Hollow State Park ： ウィキペディア英語版 Chatfield Hollow State Park Chatfield Hollow State Park is a Connecticut state park located in the town of Killingworth. The park offers hiking trails, a swimming beach, trout fishing, mountain biking, rock climbing, and picnicking areas. Park attractions include Indian caves, historic sites, a restored water wheel, and a reproduction covered bridge.〔 The Oak Lodge Nature Center is open seasonally and offers nature programs and information about the park.〔(【引用サイトリンク】url=http://www.ohranger.com/ct/chatfield-hollow )〕 ==Geology== All the bedrock (ledges) in the park consists of a type of gneiss called Monson Gneiss, a granitic pluton formed by the subduction of the ocean floor of the Iapetus Ocean under the North American continent; this was caused by the African Plate and Eurasian Plate. The Iapetus Ocean continued to close after the formation of the pluton, and the eventual collision of Avalonia with North America and subsequent intense pressure and heat caused the metamorphism of the granite into gneiss. The eventual erosion of the rock layers above over millions of years then exposed the rock seen on the surface today.〔 Monson Gneiss is a medium to coarse-grained rock, light in color, and is mainly composed of the minerals plagioclase, quartz and biotite. In some places, trace amounts of garnet, epidote or magnetite can be observed.〔 The valley holding Chatfield Hollow State Park is a glacial valley, which is easily validated by the steep declines on either side of the valley, and the abundant glacial erratics distributed throughout the area. These erratics are smooth, and removed of any sharp edges. Most are not moved very far, and as such the majority are composed of Monson Gneiss. However, erratics can sometimes be moved great distances, so there are examples of other rock types in the park.〔 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「Chatfield Hollow State Park」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.