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In geology, the terms sinistral and dextral refer to the horizontal component of the movement of blocks on either side of a fault or the sense of movement within a shear zone. These are terms of relative direction, as the movement of the blocks is described relative to each other when viewed from above.
The type of structures which form along the strike-slip fault depend on the sense of slip relative to the sense of stepping. When a sinistral fault steps to the right or a dextral fault steps to the left, a restraining bend is formed. [2] Geologists may also refer to a restraining bend as a left bend. These are areas of positive relief ...
Strike-slip faults with left-lateral motion are also known as sinistral faults and those with right-lateral motion as dextral faults. [19] Each is defined by the direction of movement of the ground as would be seen by an observer on the opposite side of the fault. A special class of strike-slip fault is the transform fault when it forms a plate ...
Sinistral mutants of normally dextral species and dextral mutants of normally sinistral species are rare but well documented occurrences among land snails in general. [8] Populations or species with normally mixed coiling are much rarer, and, so far as is known, are confined, with one exception, to a few genera of arboreal tropical snails. [8]
The terms "left" and "right", or sinistral and dextral, are sometimes used but more precise terms are preferred. Proper right and proper left are sometimes used such that the "proper right" hand of a figure is the hand that would be regarded by that figure as its right hand. [17] Terms derived from lateral include:
Vergence can be classified as dextral, when there is apparent clockwise rotation, or sinistral, when there is apparent anticlockwise rotation. [4] Although there is a shared relationship in the description of both vergence and fold pairs, they are independent of each other, as vergence is defined as a direction and not a shape.
The opposite is sinistral (Latin: sinister, left). This is consistent with the terms for right-handed screws in engineering and physics. Most species of sea snail are dextral. Within a typically dextral species, rare individuals may develop sinistral coiling. In religious usage, the shankha (sacred conch shell) is displayed spire downwards.
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