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A paleocurrent or paleocurrent indicator is a geological feature (typically a sedimentary structure) that helps one determine the direction of flowing water in the geologic past. This is an invaluable tool in the reconstruction of ancient depositional environments. There are two main types of paleocurrent indicators: * Unidirectional, which give a clear, single direction of flow * Bidirectional, which give a good linear direction, but it is unclear which direction along the linear trend the water flowed. Below are a partial list of common paleocurrent indicators:

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  • Aliran purba (in)
  • Paleocurrent (en)
  • 古水流 (zh)
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  • 古水流(英語:paleocurrent)是一種沉積結構,被用來判別當時水流的方向。古水流指標主要有兩種類型:單向性 具單一的流動方向。例如交错层理,水流波痕(英語:Current ripple marks),叠瓦結構(英語:Imbrication)。層底痕跡(英語:Sole markings)/槽模(英語:flute casts)等雙向性 提供線性方向,但不知流動方向。例如 對稱波痕(英語:br Symmetrical ripple marks),分離紋綫(英語:Parting lineations)等。 (zh)
  • A paleocurrent or paleocurrent indicator is a geological feature (typically a sedimentary structure) that helps one determine the direction of flowing water in the geologic past. This is an invaluable tool in the reconstruction of ancient depositional environments. There are two main types of paleocurrent indicators: * Unidirectional, which give a clear, single direction of flow * Bidirectional, which give a good linear direction, but it is unclear which direction along the linear trend the water flowed. Below are a partial list of common paleocurrent indicators: (en)
  • Sebuah aliran purba atau paleocurrent adalah fitur geologi (biasanya struktur sedimen) yang membantu penentuan arah aliran air dalam geologi di masa lalu. Ini merupakan alat yang sangat berharga dalam rekonstruksi kuno . Ada dua jenis utama dari indikator aliran purba: * Searah, yang memberikan gambaran yang jelas tentang satu arah aliran * Dua arah, yang memberikan jalur aliran linier, tetapi tidak dapat ditentukan arahnya. Di bawah ini adalah sebagian daftar indikator aliran purba yang umum: (in)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/FluteCast.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/WaveRipple.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/PartingLineation.jpg
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  • A paleocurrent or paleocurrent indicator is a geological feature (typically a sedimentary structure) that helps one determine the direction of flowing water in the geologic past. This is an invaluable tool in the reconstruction of ancient depositional environments. There are two main types of paleocurrent indicators: * Unidirectional, which give a clear, single direction of flow * Bidirectional, which give a good linear direction, but it is unclear which direction along the linear trend the water flowed. Paleocurrents are usually measured with an azimuth, or as a rake on a bedding plane, and displayed with a Rose Diagram to show the dominant direction(s) of flow. This is needed because in some depositional environments, like meandering rivers, the paleocurrent resulting from natural sinuosity has a natural variation of 180 degrees or more. Below are a partial list of common paleocurrent indicators: (en)
  • Sebuah aliran purba atau paleocurrent adalah fitur geologi (biasanya struktur sedimen) yang membantu penentuan arah aliran air dalam geologi di masa lalu. Ini merupakan alat yang sangat berharga dalam rekonstruksi kuno . Ada dua jenis utama dari indikator aliran purba: * Searah, yang memberikan gambaran yang jelas tentang satu arah aliran * Dua arah, yang memberikan jalur aliran linier, tetapi tidak dapat ditentukan arahnya. Aliran purba biasanya diukur dengan azimuth, atau sebagai sapuan pada bedding plane, dan ditampilkan dengan untuk menunjukkan arah yang dominan dari aliran. Hal ini diperlukan karena dalam beberapa lingkungan pengendapan, seperti meander, aliran purba yang dihasilkan dari liku alami memiliki variasi alami 180 derajat atau lebih. Di bawah ini adalah sebagian daftar indikator aliran purba yang umum: (in)
  • 古水流(英語:paleocurrent)是一種沉積結構,被用來判別當時水流的方向。古水流指標主要有兩種類型:單向性 具單一的流動方向。例如交错层理,水流波痕(英語:Current ripple marks),叠瓦結構(英語:Imbrication)。層底痕跡(英語:Sole markings)/槽模(英語:flute casts)等雙向性 提供線性方向,但不知流動方向。例如 對稱波痕(英語:br Symmetrical ripple marks),分離紋綫(英語:Parting lineations)等。 (zh)
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