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Clay dogs
Clay dogs are naturally occurring clay formations that are sculpted by river currents from glacially deposited blue-gray clay and then dried by the sun. They exhibit tremendous variety in shape and size, with some being simple and others having highly complex forms. They only occur in a few places in the world; until recently, Croton Point along the Hudson River produced them, but the clay slope that produced the dogs was subsequently demolished to extend a park lawn.〔Jacobs, Jane. ''The Death and Life of Great American Cities'' (1961)〕 Clay dogs were described in detail in an article by L. P. Gratacap, ''Opinions on Clay Stones and Concretions''.〔(【引用サイトリンク】url=http://www.jstor.org/stable/2450388?seq=1 )〕 ==References==
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「Clay dogs」の詳細全文を読む
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