what is the most distinguishing feature of sedimentary rocks?

Question

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Answer 1

Upper surfaces of beds commonly display primary sedimentary features that are classified as bedding-plane structures. A three-dimensional view may be obtained if some of these can be seen from the side as well as from the top of a pile of strata. They include such features as ripples (ripple marks), climbing ripples, rills, pits, mud cracks, trails and tracks, salt and ice…



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Answer 2

I would say it is texture and composition. Texture means the shape, size, roundness of grains, their sorting, etc, This is more important for clastic or detrital sedimentary rocks (derived from the mechanical weathering and erosion of the pre-existing rocks, because it gives us the history of origin of the rock. For chemically-derived sedimentary rocks or biogenic sedimentary rocks, the composition is more important - it gives us an idea about the environment of deposing.
Another important feature of sedimentary rocks is the primary structures (like bedding) preserved in it.