雙流向層理

雙流向層理（英語：Flaser beds）是一種沉積紋理、在間歇性水流沉積環境，造成的交替的沙泥層。例如在潮汐環境中，當水流強時，帶來的沉積物多爲砂質，並會形成沙波紋。當水流弱時，帶來的沉積物多爲泥質，並填充在沙波紋上[^[1]。雙流向層理也可以但很少在河流中形成 – 例如在點壩^[1]。雙流向層理的泥質物較少，通常次要成分。但它們可以在三個小時內鞏固，保護下面的層理免受侵蝕^[1] 。雙流向層理通常在高能環境中形成^[2]^[3]，但濁流沉積中也有被報道（Rebesco，2014 年）。與透鏡狀層理相比，雙流向層理以沙子為主。而透鏡狀層理主要由泥質組成的。

參考文獻

^ ^1.0 ^1.1 ^1.2 Martin, A.J. (2000). "Flaser and wavy bedding in ephemeral streams: a modern and an ancient example". Sedimentary Geology. 136 (1–2): 1–5. Bibcode:2000SedG..136....1M. doi:10.1016/S0037-0738(00)00085-3
^ Tom Bellile (2003-10-23). "Tidal deposits". (with photograph)
^ Reineck, H.E.; Wunderlich, F. (1968). "Classification And Origin Of Flaser And Lenticular Bedding". Sedimentology. 11 (1–2): 99–104. Bibcode:1968Sedim..11...99R. doi:10.1111/j.1365-3091.1968.tb00843.x.

[”Martin”-1] 1.0 ^1.1 ^1.2 Martin, A.J. (2000). "Flaser and wavy bedding in ephemeral streams: a modern and an ancient example". Sedimentary Geology. 136 (1–2): 1–5. Bibcode:2000SedG..136....1M. doi:10.1016/S0037-0738(00)00085-3

[”Tom”-2] Tom Bellile (2003-10-23). "Tidal deposits". (with photograph)

[”Reineck”-3] Reineck, H.E.; Wunderlich, F. (1968). "Classification And Origin Of Flaser And Lenticular Bedding". Sedimentology. 11 (1–2): 99–104. Bibcode:1968Sedim..11...99R. doi:10.1111/j.1365-3091.1968.tb00843.x.

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