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تاریخ::
محوشدگی بسیار کند
Two have so far been applied practically: the measure- ment of micro-wanes on fractured crystals (Bednarik, 1992, 1993), and the selective, often alveolar retreat in certain rock types of components that weather at vastly different rates (Bednarik, 1995b).
A statistically significant sample of micro-wane widths along the edges of such truncation surfaces is recorded under certain conditions and placed within an already available calibration curve for the region and mineral in question.
The microerosion method by micro-wane measure- ment has been used on petroglyphs in six blind tests now, in Russia, Italy and Bolivia (Bednarik, 1992, 1993, 1995b, 1997, 2000a).
However, the underlying geometric principles of wane formation were subsequently explained (Bednarik, 1992), and they apply to macro-wanes as much as to micro-wanes.
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