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| highly organic (primary group) (i.e. peat) |
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Definition
| Well Graded (secondary modifier) |
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| Poorly sorted (secondary modifier) |
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| Liquid Limit <50% (lean clay; secondary modifier) |
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| Liquid Limit >50% (fat clay; secondary modifier) |
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| gravelly sand; poorly graded sand |
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| poorly graded gravel-sand-silt mixture |
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| poorly graded gravel-sand-clay mixture |
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| inorganic clay; lean clay |
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| Organic silt or silt/clay; low plasticity |
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| Inorganic silt; elastic silt |
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| >50% larger than No.04 sieve |
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Definition
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| >50% smaller than No.04 sieve |
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Definition
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| material passing No.200 sieve |
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Definition
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| H; high plasticity; "fat" |
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Definition
| L; low plasticity; "lean" |
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Term
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Definition
fines (by wt.%) in coarse grained sample
necessary to use dual classification (GP-GM) |
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Term
| If a fine grained sample has >30% coarse material |
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Definition
| descriptive term "gravelly" or "sandy" as needed |
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Term
| If a fine grained sample has 15-30% coarse material |
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Definition
| "with sand" or "with gravel" description as needed |
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Definition
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Definition
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Definition
| Poorly graded sand with clay |
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Definition
| Well graded sand with clay |
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Definition
| Poorly graded gravel with silt |
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Definition
| Comprised almost entirely of organic detritus. |
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Definition
| Encompasses all weathered, non-bedrock horizons O, A, B, and C. |
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Term
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Definition
No O-horz.
V. Thin A-horz.
Thin B-horz.
Thicker C-horz. |
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Term
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Definition
Thin O-horz.
Thin A- and B-horz. |
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Term
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Definition
Thickest O- and A-horz.
Typically thickened B- and C-horz. |
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Definition
| Strong A-horz. leaching creates richly coloured B-horz. |
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Definition
| Chemically weathered rock, typical of the C-horz. |
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Definition
| Minimal concentrations of Fe, Al, clay, and organic compounds due to humid environment rainfall. |
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Definition
| Thickened, with elevated concentrations of Fe, Al, clay, and organic compounds due to humid environment rainfall. |
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Definition
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| Weathering of olivine, pyroxene, hornblende |
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Definition
| Kaolinite, bauxite, hematite, goethite. |
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Term
| Weathering of micas (biotite/muscovite) |
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Definition
| Illites or montmorillonites |
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Term
| Chem. weathering of volcanic ash/tuff |
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Definition
| Bentonite (soft rock composed of smectite clay minerals). Bentonite is a swelling clay. |
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| First minerals to chemically decompose at Earth's surface |
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Definition
| Olivine and anorthite (ca-plagioclase) |
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Definition
| Found in B-Horizon; a product of high concentration of leached minerals. |
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Definition
| A result of feldspar weathering in temperate environs. |
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Definition
| A result of mechanical weathering of granites. |
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Definition
| A result of feldspar weathering in humid/tropical environs. |
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Definition
| A result of chemical weathering of feldspar. |
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Definition
| Stream loads consist of quartz sands and high-Al clays. |
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Term
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Definition
| Stream loads consist of feldspar-rich sands; smectite and illite clay fraction. |
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Term
| Evaporite Mineral Progression |
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Definition
| Calcite/Gypsum/Halite/Mg sulfates/ Na bromide |
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Definition
| A low pH environment bacteria which can accelerate pyrite weathering considerably. |
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Definition
| pH environment >6 eliminates bacterial weathering impact. |
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