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Face Stone
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A diamond inset in the face portion of a bit.
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Fault Line
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The intersection of a fault surface or a fault plane with the surface of the Earth or with any artificial surface of reference. Syn: fault trace; fault trend.
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Fault Gouge
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A layer of hardened clay lining a fault plane, commonly showing grooves and striae indicating the direction of most recent movement. Syn: fault casing
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Facies Map
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A map showing the distribution of different types of rock attributes or facies occurring within a designated geologic unit.
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Fault Basin
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A region depressed relative to the surrounding region and separated from it by bordering faults.
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Ferrosilicon
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Alloy of iron and silicon.
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Fecal Pellet
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An organic excrement, mainly of invertebrates, occurring esp. in modern marine deposits but also fossilized in some sedimentary rocks; usually of a simple ovoid form less than a millimeter in length, or more rarely rod-shaped with longitudinal or transverse sculpturing, devoid of internal structure, and smaller than a coprolite. Also spelled faecal pellet.
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Flagger
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In bituminous coal mining, a laborer who attaches a flag to the rear car of a loaded train of cars (if the flag is missing at end of a haulage trip, it denotes that the train has lost one or more cars, and all motormen are warned). Also called flagman.
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Fault Growth
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Intermittent, small-scale movement along a fault surface that, accumulated, results in considerable displacement.
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Fossilized
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Preserved by burial in rock or earthy deposits; turned to a fossil.
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