双流向层理

双流向层理（英语：Flaser beds）是一种沉积纹理、在间歇性水流沉积环境，造成的交替的沙泥层。例如在潮汐环境中，当水流强时，带来的沉积物多为砂质，并会形成沙波纹。当水流弱时，带来的沉积物多为泥质，并填充在沙波纹上[^[1]。双流向层理也可以但很少在河流中形成 – 例如在点坝^[1]。双流向层理的泥质物较少，通常次要成分。但它们可以在三个小时内巩固，保护下面的层理免受侵蚀^[1] 。双流向层理通常在高能环境中形成^[2]^[3]，但浊流沉积中也有被报道（Rebesco，2014 年）。与透镜状层理相比，双流向层理以沙子为主。而透镜状层理主要由泥质组成的。

参考文献

^ ^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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