1. Biogenic components
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1a. Microfossils |
1a.1. Morphological diversity (taxonomy, if possible) |
1a.2. Relative abundance: number of specimens in field of view |
1a.3. Mode of occurrence: dispersed or concentrated in clusters or laminae |
1b. Amorphous organic matter |
1b.1. Mode of occurrence: dispersed in crystalline net; as irregular masses; as short filaments or elongated corpuscles; between grains or crystals |
1b.2. Relative abundance: number of clusters, filaments, or corpuscles in each microscopic field |
1b.3. Color |
1b.4. Transparency: transparent, translucid, opaque |
1c. Allochemical biogenic components |
1c.1. Type: (e.g., shells and bones) |
1c.2. Relative abundance: number of components and % of area in field of view |
1c.3. Roundness |
1c.5. Relative abundance: number of grains in field of view |
1c.6. Mode of occurrence: dispersed; in lens; as patches, encompassing the biological components |
1c.4. Sorting |
2. Mineral components
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2a. Trapped, bounded, or agglutinated mineral components |
2a.1. Mineralogy |
2a.6. Relative abundance: number of grains in field of view |
2a.7. Mode of occurrence: dispersed; in lens; as patches, encompassing the biological components |
2a.2. Grain size |
2a.3. Morphology |
2a.4. Roundness |
2a.5. Sorting |
2b. Precipitated mineral components |
2b.1. Mineralogy |
2b.2. Authigenic crystal mosaic: hypidiotopic; xenotopic; idiotopic; poikilotopic; porphyrotopic |
2b.3. Mode of occurrence: dispersed; as laminae; in clusters; encompassing the biological components; as relic or palimpsestic |
2c. Accessory minerals |
2c.1. Mineralogy |
2c.4. Relative abundance: number of minerals per field of view or % of area in field of view |
2c.4. Mode of occurrence: dispersed; clustered; associated with another textural component |
2c.2. Dimensions |
2c.3. Morphology |
2d. Allochemical components |
2d.1. Type: (e.g., ooids) |
2d.2. Relative abundance: number of components and % of area in field of view |
2e. Primary porosity (fenestrae) |
2e.1. Dimension |
2e.2. Pore shape and borders: irregular, elongate, equidimensional; rounded, sharped, angular to irregular |
2e.3. Orientation relative to lamination: concordant, discordant (perpendicular, oblique) |
2e.4. Relative abundance: number = % porosity in field of view |
3. Quality of preservation of organic components
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3a. Relative to chemical degradation of walls, sheaths and amorphous organic matter varying from smooth and continuous, with original thickness minimally altered (excellent) to grainy, discontinuous, degraded (poor). |
3b. Relative to structural integrity of individual cells and sheaths and internal mat structure, varying from undeformed, amply represented and distributed (excellent) to deformed, irregularly preserved and patchily distributed (poor) to vestigial and faintly evident (palimpsestic). |
FABRIC
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4. Features related to chemical processes
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4a. Dissolution surfaces |
4a.1. Orientation relative to lamination: concordant (parallel) or discordant (perpendicular, oblique) |
4a.2. Relative abundance: abundant (observable in all fields of view), common (observable in most fields of view), rare |
4a.3. Extent: localized or widespread |
4a.4. Effect upon fossil assemblage: great, moderate, little |
4a.5. Effect upon amorphous organic matter |
4a.6. Effects upon mineral assemblage |
4b. Stylolite (diagenesis involving pressure and dissolution) |
4b.1. Type or style: columnar, irregular, high or low amplitude, hummocky, smooth |
4b.2. Nature of stylolite sets: parallel, irregular, anastomosed, conjugated |
4b.3. Orientation relative to lamination: concordant (parallel) or discordant (perpendicular, oblique) |
4b.4. Mode of occurrence: limited to laminae; at laminar contacts; widespread or localized |
4c. Dissolution of components |
4c.1. Origin related to recrystallization, substitution, stylolitization, indeterminate |
4c.2. Mode of occurrence
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4c.3. Relationship with laminae components
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affects only the biological components
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affects only primary minerals
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affects only accessory minerals
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affects only secondary minerals
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affects all laminae components
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4c.4. Secondary porosity dissolution
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intraparticular
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interparticular
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moldic
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intracrystalline
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intercrystalline
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vug porosity
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cavern porosity
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fenestrae porosity
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4c.5. Fenestrae-forming dissolution
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elongated fenestrae
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rounded, irregular shaped fenestrae
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sharped, irregular shaped fenestrae
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tubular fenestrae
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4d. Cement |
4d.1. Mineralogy |
4d.2. Morphology: poikilotopic, fibrous, lamellar, botryoidal, acicular, irregular |
4d.3. Mode of occurrence: primary or secondary; filling intergranular or intraparticular porosity |
4e. Recrystallization |
4e.1. Degree: total, partial |
4e.3. Micrite > micro- or pseudospar |
4e.4. Micro- or pseudospar > micrite |
4e.5. Dolomitization |
4e.6. Chalcedony > microquartz > megaquartz |
4e.2. Recrystallized crystal mosaic: hypidiotopic; xenotopic; idiotopic; poikilotopic; porphyrotopic |
4f. Substitution |
4f.1. Mineralogy (e.g., silica, ferruginous, pyrite) |
4f.2. Timing: early diagenetic, late diagenetic |
4f.3. Degree: total, partial (localized, preferential), pseudomorphic |
4f.4. Substituted crystal mosaic: hypidiotopic, xenotopic, idiotopic, poikilotopic, porphyrotopic |
4g. Nodules |
4g.1. Mineralogy |
4g.2. Size and morphology |
4g.3. Abundance: number of nodules per field of view or % of area in field of view |
4g.4. Mode of occurrence: dispersed, clustered, associated with another fabric component |
5. Features related to physical processes
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5a. Compaction |
5a.1. Type: compaction or fold |
5a.2. Orientation relative to lamination: parallel, perpendicular, oblique |
5a.3. Laminar components affected: all (entire lamination) or only biological components, primary minerals, accessory minerals, or secondary minerals |
5b. Faults |
5b.1. Type: normal, reverse, transcurrent |
5b.2. Relative abundance: number of faults in field of view |
5b.3. Orientation relative to laminae: parallel, perpendicular, oblique |
5c. Fractures |
5c.1. Type: joint, crack, fissure |
5c.2. Relative abundance: number of fractures per field of view |
5c.3. Orientation relative to lamination: concordant (parallel) or discordant (perpendicular, oblique) |
5c.4. Mineralogy of fracture fill |
5d. Erosional features |
OTHER FEATURES
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6. Recurrence of texture and/or fabric
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6a. Repetitive A-A-A-A-… |
6b. Alternating A-B-A-B-A-… |
6c. Regular (complete) cycle A-B-C-A-B-C-… |
6d. Irregular (incomplete) cycle A-B-C-A-B-A-C… |
7. Lateral continuity and uniformity of lamina thickness (includes thickness in μm or other scale)
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7a. Continuous and uniform |
7b. Lamina is laterally continuous, but the thickness can vary. Indicate the reason:
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because of factors intrinsic to the microbial mat (e.g., desiccation and osmotic pressure)
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because of extrinsic (e.g., erosion and wave action)
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7c. Laterally discontinuous |