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Most work on cliff notches in the Tropics and Subtropics has been on calcareous substrates that experience chemical or biochemical corrosion and the erosional and protectional effects of boring and encrusting marine organisms. There are deep notches in coarse andesitic lahar deposits along the subtropical western coast of the La Paz Peninsula in Baja California, Mexico. Many notch-forming mechanisms...
Laboratory and field work was conducted to determine rates of surface downwearing on shore platforms at two sites in the Bay of Fundy, Canada; these data are needed to assess and model the effect of downwearing mechanisms on platform evolution. Sandstone and basalt samples (900) were exposed to semidiurnal tidal cycles over 3years, using de-ionized water or artificial sea water. They were immersed...
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