Abstract
PROF. L. U. DE SITTER1 considers that in flow folding “internal movement itself is no longer orientated but can take any direction”, and that the position of shear planes is random. He believes it developed most typically in incompetent rocks like salt, or at very high confining pressures or high temperatures. It is further maintained that this is the only true plastic deformation of rocks. These beliefs have recently been reiterated and enlarged on2.
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References
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WILLIAMS, E. Flow Folding in Rocks. Nature 189, 474–475 (1961). https://doi.org/10.1038/189474b0
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DOI: https://doi.org/10.1038/189474b0
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