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aeolian arenite azimuth bed or rock bedding surfaces bioturbated bivalves breccias burrow calcite calcrete carbonate Carboniferous cavity cement changes channel chert clasts clay coal coarse coarser colour common conglomerates cracks cross strata cross-bed cross-bedding cross-lamination cross-stratification cryptalgal current ripples debris delta desiccation diagenesis diagenetic dolomite dunes elongate environments evaporites facies Deposition Facies sequences flow fluviatile fragments geometry graded bedding grain-size grains graphic log Groove casts handlens hardground infilled lamination lateral lenticular limestones lineation lithofacies lithology marine massive matrix measure ment metres micrite minerals mudrocks nodules occur ooids organisms origin outcrop palaeocurrent direction palaeoslope particles pebbles pelagic peloids planar preferred orientation present quartz reef limestones reworking rock unit rootlets sand waves sandstones scale Section sedi sediment bodies sedimentary rocks sedimentary structures shape siliciclastic skeletal slump stromatolites stylolites synaeresis Table tabular texture tidal tion trace fossils trough turbidite types typically vector mean vertical volcaniclastic wave-formed ripples