...The pediment is the transport surface of the gravel produced on the mountain slope, so a thin layer of gravel is usually temporarily deposited on its surface. As the mountain shrinks, the pediment expands, but at the same time, gravel begins to accumulate at the end, forming a depositional pediment, or peri-pediment (bajada). The synthetic alluvial fan in front of the mountain is also called bajada. From Bolson…In the early stages of the formation of the bolson, many alluvial fans were formed in the foothills around it. However, as the mountains eroded, a pediment formed in front of it, and the center of the bolson became a sedimentary pediment filled with thick sediments, called a peripediment or bajada (the synthetic alluvial fans in front of the mountains are also called bajadas). Eventually, as the surrounding mountains fell and the center of the bolson rose, the basin became gradually shallower, and the bolson reached its final stage. … *Some of the terminology explanations that mention "peripediment" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ペディメントは山地斜面で生産された砂礫の運搬面であるから,普通その表面に薄く砂礫が一時的に堆積している。山地が縮小するとともにペディメントは拡大するが,同時に末端部分での砂礫の堆積が始まり,堆積ペディメント,すなわちペリペディメントperipediment(バハダbajada)となる。なお,山地前面の合成扇状地も同様にバハダと呼ばれる。… 【ボルソン】より…ボルソンが形成された初期には,その周辺の山麓部にたくさんの扇状地が形成される。しかし山地の浸食が進むとともに,その前面にペディメントが形成され,ボルソンの中央部はペリペディメントperipedimentまたはバハダbajadaと呼ばれる(山地前面の合成扇状地も同様にバハダと呼ばれている)厚い堆積で埋められた堆積ペディメントとなる。やがて周辺の山地の低下,ボルソン中央部の上昇により,盆地はしだいに浅くなり,ボルソンの終末期となる。… ※「peripediment」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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