. Shore processes and shoreline development . O CI, aO o PROBABILITY OF MARINE PLANATION 253 planes which have been exposed to erosion for a period whichmay be estimated as one or more millions of years^^, not onlyhave not been reduced nearly to sealevel, but seem to standsomewhere near the original positions of the upland many more millions of years would be required to reducethese areas of hard rock to a low-lying surface of fluvial denu-dation. How much this time might be shortened by seolianerosion is prol^lematical; but the combined action of the sub-aerial forces could scar
. Shore processes and shoreline development . O CI, aO o PROBABILITY OF MARINE PLANATION 253 planes which have been exposed to erosion for a period whichmay be estimated as one or more millions of years^^, not onlyhave not been reduced nearly to sealevel, but seem to standsomewhere near the original positions of the upland many more millions of years would be required to reducethese areas of hard rock to a low-lying surface of fluvial denu-dation. How much this time might be shortened by seolianerosion is prol^lematical; but the combined action of the sub-aerial forces could scarcely accomplish the work in so short atime as a few million years. It appears, therefore, that while it is not possible to more thanguess at the time required for the subaerial denudation of acontinent, the advantages are not so overwhelmingly in favorof subaerial denudation, and against marine denudation, as hasbeen supposed to be the case. There are indeed, as we havealready seen, certain marked advantages in favor of marineplanation, not
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