Sedimentary structures and features described in the document include graded bedding, ripple marks, cross-bedding, mudcracks, burrows, and sole structures. Sedimentary rocks mentioned include sandstone, shale, limestone, dolomite, coal, evaporites such as halite and gypsum, and breccia. Breccia forms from accumulation of angular rock fragments and can be distinguished from conglomerate based on the roundness of fragments.