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, Figure 4 Field and thin-section photographs of homogeneous clayey mudstones and laminar silty 1031 mudstones (F1) in the SCI c Formation. (A) Alternations of darker and purplish layers consisting of 1032 clayey silty carbonates and microbial mudstones overlain by a domal stromatolite
, The domal stromatolite represents the lower part of a complex zone of giant stromatolites (15-20 m in 1034 height), section D. (B, C, D) Planar and undulating platy limestones (3-5 cm-thick) showing 1035 alternations of homogeneous carbonate muds and slightly laminar silty mudstones identified as MISS 1036 (Microbial Induced Sedimentary Structures) by petrographic description, D and O sections, p.1037
, Microbial mats (dark laminations or MISS undulating levels) within a fine microsparitic matrix
, Quartz, feldspars and pyrite are recognized within the matrix or overlie the microbial mats, section D. 1039 (F) Dark bacterial filament in a microsparitic matrix
, Upper 1042 part of a giant domal stromatolite with 4-5 m in width, section H. (B) Columnar stromatolite with 1043 parallel columns, section P. (C) Centimetric alternations of grey planar microbial mats and 1044 accumulations of coarse-grained stromatoclasts forming radial-bundles, section F. (D) Giant "cigare" 1045 or coned-shaped stromatolite (10-15 m in length), section F . (E) Wavy and planar microbial mats, Figure 5 Field photographs of the stromatolitic facies (F2 and F6) in the SCI c Formation. (A), p.1046
, section M . (F) Small domal stromatolite overlying or laterally relayed by planar microbial mats, p.1047
, Succession of domal stromatolites in the top of a stromatolitic bioherm (15-20 m in (lower part of the picture) are well developed, with high amplitude, as is generally the case in all the 1056 oolitic grainstones, section I. (F, G) HCS with furrows showing flat (less) and hollow (more) bottoms 1057 passing in the upper part to mega-ripples (cross-laminations), p.1058
, As described later, the cementation consists of isopachous lamellar calcite and a blocky calcite, 1066 section MAD8018. (C) Asymmetric oolite with a concentric cortex and coarse-grained slightly 1067 rosette-like nuclei, section I. (D) Greyish floatstone with dominant aggregates, see (F) for facies 1068 description, section MAD8018. (E) Part of centimetric grapestone in a floatstone ooid-aggregate (F3b), the grapestone consists, overlying columnar stromatolites (F2), irregular contact between F3a and F2 with thick oolite beds 1059 overlying giant stromatolite, section T. (F3a), p.1070
, F) Millimetric aggregates in a floatstone or 'false' rudstone, see (D) for the field photograph, section MAD8017
, Figure 8 Thin-section and field photographs of lagoonal facies (F3c) and intraformational 1077
, Peloidal grainstone-packstone with micritic oolites and 1078 relics of larger oolites exhibiting a fine concentric structure in the outer part of the cortex, section 1079 MAD8018. (B) Peloidal packstone without micritic oolites or larger concentric oolites as described 1080 previously, section MAD8018. (C and E) Homogeneous mudstone with pyrite and oxidized organic 1081 matter relics (see arrow in C), section MAD8016. (D) Succession of centimetric beds of greyish 1082 homogeneous mudstones, section MAD8019. (F) Peloidal grainstone showing herringbone cross-1083 stratifications, top of Saris Section (MAD8017). (G) Intraformational conglomerate showing 1084 elongated mud-clasts and oolites relics with vadose cementation, conglomerate (F4) in the SCI c Formation. (A), p.1085
, conglomerate with plurimillimetric and inframillimetric mud-clasts. The larger ones are elongated and 1086 affected by vertical cracks, section MAD8017
, Figure 9 Thin-section and field photographs of peritidal facies (F3d, F4 and F6) in the SCI c 1089
, See (B) and (C) for the 1090 microfacies description. (B, C) Plurimillimetric pisoids showing a fine concentric structure, the 1. The SCIc Formation records the evolution of a marine ramp 2. It is a carbonate succession of meter-scale shallowing-upward cycles 3. The cycles are the result of the interplay of relative sea-level changes
, The SCI c cycles are enclosed into a third-order sequence related to the deposition of the SCI Subgroup