平行层理是指在较强的水动力条件下,高流态中由平坦的床沙迁移、在床面上连续滚动的沙粒产生粗细分离而显出的水平细层,沿层理面易剥开,在剥开面上可见到剥离线理构造。 平行层理一般出现在急流及能量高的环境,如河流、海滩等环境中,常与大型交错层理、底冲刷相伴生。
具丘状、洼状交错层理或平行层理的砂岩;
B. sandstone with hummocky or sunken cross bedding and parallel bedding;
粒序层理、块状层理、平行层理、交错层理、波状层理十分发育;
Depositional beddings such as graded bedding, massive bedding, parallel bedding, cross-bedding and wave bedding, are well developed;
一个平行于机械软弱层或层理断层面,它把其上未形变的岩石或其下不同形变的岩石拆离或分隔开。
A fault surface parallel to a mechanically weak horizon or layer, or parallel to bedding, that detaches or separates deformed rocks above from undeformed or differently deformed rocks below.
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