"Leg 207, Site 1258 Thin Section Data" Sample Mineral Biogenic Rock Leg Site H Cor CT Sct Top (cm) Bot (cm) Depth (mbsf) Thin Section Number Lithology Barite Calcite Inorganic Calcite Clay Dolomite Feldspar Glauconite Phosphorite Opaque minerals Chalcedony Quartz Zeolite Bioclast Ebridians Diatoms Fish Remains Nannofossils Foraminifers Planktonic foraminifers Benthic foraminifers Shell fragments Sponge spicules Radiolarians Siliceous matrix Fecal Pellet Micrite Sparite Organic Debris organic matter Other Lithology Comments 207 1258 A 3 R 4 60 65 19.3 29 15 * 26 59 100 Radiolarian chalk with foraminifers (Radiolarian/foraminifer wackestone to packstone) Thin section is of very poor quality. 207 1258 A 5 R 1 70 72 33.9 30 D 5 35 60 100 Foraminifer wackestone) Thin section is very poor quality. Foraminifers are quite often empty or partly empty. Micrite is as matrix. 207 1258 A 28 R 1 29 32 255.19 32 D 30 70 100 Foraminifer wackestone / packstone Micrite matrix. Areal coverage of foraminifers. 207 1258 A 28 R 3 56 59 258.46 33 D 1 19 * 80 100 Foraminifer wackestone Sharp decrease in foraminifer content in burrows. 207 1258 A 29 R 2 98 100 267.08 34 D 20 40 * 40 * 100 Foraminifer wackestone "Foraminifers are filled with micrite, clayey micrite and rarely with sparite (blocky calcite). Trace of Echinoid fragments" 207 1258 A 33 R 3 29 31 306.39 35 D 1 49 * 50 100 Foraminifer wackestone to packstone "Thin section came off glass slide. Micrite matrix. Foraminifers are filled with blocky calcite (clear crystals), empty (due to TS preparation), or filled with micrite. In upper part of TS, foraminifers generally filled with siliceous material (cryptocrystalline quartz+clay)." 207 1258 A 38 R CC 0 5 357.01 31 D 30 * * 5 15 50 100 Zeolitic wackestone with radiolarians Radiolarians are replaced by zeolite. One big agglutinate foraminifer made of quartz silt. 207 1258 A 42 R 1 88 89 390.68 37 M 25 11 2 11 21 25 5 100 Foraminifer wackestone with glauconite and phosphorite Fish remains include phosphate. Background micrite. 207 1258 A 42 R 2 43 44 391.73 38 D 35 10 10 35 10 100 Wackestone with phosphorite (black shale with phosphorite) Laminated (clayey chalk with phosphate). Foraminifers are concentrated in certain intervals. Clay and micrite as matrix. Fish remains are with phosphatic nodules. 207 1258 A 42 R 2 70 71 392 39 D 36 1 11 5 28 19 100 Wackestone with organic matter Calcareous claystone with fish remains and organic matter. 25% of micrite is matrix; 3% is fecal pellets. Fish remains include phosphate. 207 1258 A 43 R 1 111 115 400.51 40 D 15 2 15 16 50 2 100 Foraminifer wackestone Flasered-thinly bedded appearance. Microspar matrix. Micrite patches (fecal pellets?) 207 1258 A 43 R 3 27 30 402.21 41 D 20 1 * 32 27 15 5 100 Foraminifer wackestone alternating with packstone No obvious size-sorting in this thin section. Micrite and clay matrix. 207 1258 A 43 R 3 51 54 402.45 36 D 50 2 3 5 20 20 100 Calcareous claystone with organic matter Typical black shale. Organic matter is mainly granular. 207 1258 A 46 R 2 19 20 424.85 42 M 15 55 30 100 Foraminifer packstone with abundant fish debris Chunky sparite and blocky calcite--very small granules but not opaque. Fish remains are well preserved. 207 1258 A 48 R 2 92 95 435.21 43 M 45 20 2 3 5 20 5 100 Clayey chalk with diagenetic calcite Black shale in the process of being replaced by diagenetic calcite. Cone-in-cone structure. 207 1258 A 49 R 1 25 29 438.15 44 D 77 10 5 3 5 100 Crystalline limestone (with layers of coarse-grained diagenetic calcite) Diagenetic layers show initial stages of the formation of a cone-in-cone structure. 207 1258 A 49 R 3 97 100 441.81 45 D 10 3 1 7 10 5 31 30 3 100 Foraminifer wackestone Lower part: Foraminifer wackestone with microsparitic matrix. Upper part: Foraminifer wackestone with micritic matrix. 21% micrite matrix. 30% microsparite.10% micrite in fecal pellets. 207 1258 A 49 R 3 127 130 442.11 46 D 25 4 2 13 25 31 100 Foraminifer wackestone with fish debris Opaque minerals are up to 10% in some areas. 15% micritic fecal pellets and 16% micrite matrix. 207 1258 A 50 R 1 123 126 443.73 47 DM 60 10 2 20 5 1 2 100 Diagenetic calcite with fish debris Clay and organic matter form original black shale. Fish remains contain one large phosphate nodule. 207 1258 A 50 R 2 22 25 443.98 48 M 50 10 2 5 25 5 3 100 Diagenetic calcite concretion with fish debris and phosphorite 207 1258 A 50 R 3 97 100 446.16 49 D 3 5 1 * 11 80 100 Chalk with calcite replaced radiolarians Radiolarians are replaced by sparite. Microspar matrix. Calcite is coarse vein calcite. 207 1258 B 13 R 3 116 118 122.36 -50 See comments Sample returned. Not made into thin section. 207 1258 B 38 R 2 123 126 352.03 51 5 2 1 5 1 1 15 70 * 100 Chalk with radiolarians Zeolites are not in radiolarians. Micrite matrix contains unquantified amount of opal CT. 207 1258 B 39 R 4 45 47 363.95 52 D 6 1 3 * 15 75 100 Chalk with radiolarians / Radiolarian wackestone Radiolarians are oriented parallel bedding-partly disturbed by bioturbation. Foraminifers are more abundant in burrows; mainly fragments with blocky calcite filling. Micrite matrix may contain opal. 207 1258 B 44 R 2 8 11 394.24 53 D 1 4 1 1 3 8 62 20 100 Chalk Chalk is slightly siliceous. Micrite might contain opal CT. Microsparite in burrows. 33 1258 B 44 R 2 32 36 394.48 54 D 10 33 12 10 2 1 7 * * * 5 20 100 Calcareous claystone with glauconite (bioturbated) Fish remains include phosphate. Calcite is coarse-grained. Micrite is in matrix. 207 1258 B 44 R 2 50 53 394.66 55 D 40 11 5 2 * 5 15 5 16 1 100 Calcareous claystone with glauconite and foraminifers (bioturbated) Patchy-wavy appearance. Silica in matrix. Fish remains include phosphate. Foraminifers are unevenly distributed. Bioclasts are shell fragments. 207 1258 B 44 R 2 63 66 394.79 56 D 1 2 37 1 2 1 3 15 5 25 8 100 Calcareous claystone with foraminifers Foraminifer black shale with huge burrow Foraminifers are filled with blocky calcite or clay. Micrite in matrix. Coarser-grained diagenetic calcite. Quartz in burrow. 207 1258 B 44 R 3 35 39 395.68 57 D 40 8 5 3 1 10 16 17 100 Calcareous claystone with foraminifers Bioclasts are shell fragments (Inoceramus?). Micrite is in matrix. 207 1258 B 45 R 3 108 111 400.43 58 D 15 7 1 15 45 14 3 100 Chalk with foraminifers and clay Micrite matrix. Microsparite (recrystallization). 207 1258 B 45 R 4 114 117 401.9 59 D 42 10 10 3 * 10 25 100 Organic matter claystone Micrite in background. 207 1258 B 46 R 2 103 106 404.77 60 D 28 5 3 7 11 8 30 8 100 Clayey chalk with foraminifers Silicification concentrated in certain layers. Opaque minerals are spherical. Micrite in matrix. Fish remains include phosphate. 207 1258 B 51 R 2 109 112 428.81 61 M 83 7 1 5 3 1 100 Diagenetic calcite / Calcite concretion Diagenetic calcite. Fish remains in one layer. 207 1258 B 53 R 1 23 28 436.13 62 M 24 3 * 25 15 25 8 100 Alternating calcareous claystone and phosphorite sand "Spectacular thin section. Fish remains include phosphate. 15% micrite in matrix, 10% micrite in flattened pellets." 207 1258 B 54 R 1 8 11 441.58 63 M 89 8 * * 3 100 Diagenetic calcite concretionary layer Coarse-grained diagenetic calcite. 207 1258 B 54 R 1 42 45 441.92 64 D 20 3 5 17 54 1 100 Limestone with clay "Microspar to sparite. 10% micrite in clusters, 7% micrite in pellets." 207 1258 B 54 R 1 66 69 442.16 65 D 15 1 1 7 7 68 1 100 Limestone with clay / Wackestone """Laminated"" foraminifer sand. Bioclasts are bivalve debris including Inoceramus. Foraminifers are fragments." 207 1258 B 54 R 1 77 80 442.27 66 D 15 2 20 * 8 30 25 100 Limestone with bioclasts / Wackestone Micrite peloids. Microspar matrix. Bioclasts are bivalves and juvenile ammonites. 207 1258 B 55 R 1 12 15 445.62 67 20 * 4 8 8 57 3 100 Wackestone with foraminifers and calcareous shell fragments "Microsparite is recrystallized matrix. Clay includes dark material (oxides) incorporated. Foraminifers are filled with blocky calcite. Shells include ""oysters"" and ""neomorphic"" shells." 207 1258 B 55 R 2 84 86 447.46 68 D 50 20 2 9 4 13 2 100 Calcareous claystone / Diagenetic calcite Black shale replaced by diagenetic calcite (cone-in-cone structure). Foraminifers are filled with blocky calcite. 207 1258 B 56 R 2 30 32 452.57 69 M 30 20 8 17 21 2 2 100 Bioclastic wackestone to packstone "Very poor thin section. Bioclasts are shell fragments. Sparite around shells. 10% micritic fecal pellets, 11% micrite in matrix." 207 1258 B 56 R 3 59 61 453.7 70 M 5 * 4 * 15 1 25 5 45 100 Bioclastic limestone / Bivalve shell wacke Fish remains include phosphate. Micrite is original matrix. 207 1258 B 57 R 1 63 67 455.83 71 86 * 2 2 10 * * 100 Limestone (diagenetic) 207 1258 C 15 R 3 93 97 393.7 72 D 20 * 1 3 1 20 1 1 * 2 50 1 100 Micrite with zeolite (radiolarians) and clay CHALKY PART. Chalk/black shale transition. Other material is opaque minerals with interesting outlineÐÐ pseudomorphs after rhodochrosite? 207 1258 C 15 R 3 93 97 393.7 72 D 38 3 4 5 1 2 7 9 23 7 1 100 Calcareous claystone BLACK SHALE. Chalk/black shale transition. 207 1258 C 15 R 3 123 126 394 73 D 10 2 10 65 10 3 100 Micrite with foraminifers (foraminifer wackestone) Peloidal(?) micrite. Granular organic debris. 207 1258 C 27 R 2 29 32 449.2 74 M 98 2 100 Limestone (diagenetic) "Calcite is very well crystallized patch work of different crystal sizes. Ghosts of original ""beef structure"". Other 2% is unknown remains of original mud." 207 1258 C 27 R 2 45 48 449.36 75 67 11 10 5 5 2 100 Limestone with pyrite Opaque mineral is probably pyrite. Calcite is sparite.