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dip
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The angle at which a bed, stratum, or vein is inclined from the horizontal, measured perpendicular to the strike and in the vertical plane.
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strike
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"The angle between true North and the horizontal line contained in any planar feature (inclined bed, dike, fault plane, etc.); also the geographic direction of this horizontal line. "
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axial plane
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An imaginary plane that cuts through a fold dividing it as symmetrically as possible.
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limb
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The relatively planar part of a fold or of two adjacent folds (for example, the steeply dipping part of a stratum between an anticline and syncline).
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anticline
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A upward-curving (convex) fold in rock that resembles an arch. The central part contains the oldest section of rock
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anticline
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A fold that is concave in a downward direction -- that is the vertex is the lowest point.
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syncline
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" A large fold whose limb are higher than its center; a fold with the youngest strata in the center. "
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monocline
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The S-shaped fold connecting two horizontal parts of the same stratum at different elevation. Its central limb is usually not overturned.
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basin
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In tectonics, a circular, syncline-like depression of strata. In sedimentology, the site of accumulation of a large thickness of sediments.
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uplift
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A broad and gentle epeirogenic increase in the elevation of a region without a eustatic change of sea level.
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subsidence
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A gentle epeirogenic movement where a broad area of the crust sinks without appreciable deformation.
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warping
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In tectonics, refers to the gentle, regional bending of the crust, which occurs in epeirogenic movements.
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fold
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A planar feature, such as a bedding plane, that has been strongly warped, presumably by deformation.
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recumbent fold
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An overturned fold with both limb nearly horizontal.
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hinge
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The part of a fold that is the most sharply curved.
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young
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A stage in the geomorphic cycle in which a landscape has just been uplifted and is beginning to be dissected by canyons cut by young streams.
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