Fig. 5

Distinctive petrographic features of the subfacies. Pictures from the split core. Scale bar indicates two centimetres. Blue arrows evidence epoxy resin. a Shaly facies (SF1). Yellow arrow points to mm thick rounded lenses, interpreted as bioturbational structures. b Carbonate-rich sandy facies (SF2). Yellow arrows show small ripples and thin, discontinuous, wavy laminae. White arrow indicates a thin, continuous, bioclastic lamina. c Sandy facies (SF3). Yellow arrows point to bioturbational structures. d Sandy facies (SF4). Yellow arrows evidence mud drapes. e Carbonate-rich sandy facies (SF4). Yellow arrows point to cm thick pyritized burrows. f Carbonate-rich sandy facies (SF2 and SF5). Yellow arrow evidences a SF5 patch. White arrow points to starved ripples (SF2). g 6 cm thick, authigenic, calcareous bed within the shaly facies. Cone-in-cone structures are not visible at macroscopic scale. h Boundary between shaly and carbonate-rich sandy facies (SF1 and SF4). Compacted, bioturbational lenses of SF4 appear within the shaly facies right below the boundary. i Carbonate-rich sandy facies (SF4). Yellow arrow evidences a brownish area associated to micritic siderite