The Path of the Pole by Charles Hapgood

Author:Charles Hapgood [Hapgood, Charles]
Language: eng
Format: mobi, epub
Publisher: SCB Distributors - A
Published: 2010-04-01T16:00:00+00:00

4. CHANGING SEA LEVELS

An important problem closely related to that of mountain building is that of the cause of very numerous, and in some cases radical, changes in the elevations of land areas relative to the sea level. Umbgrove finds that mountain folding has been related, in geological time, to uplift of land areas or to withdrawal or regression of the sea (420:93). However, it is clear that the uplifts were not confined merely to the folded areas—that is, to the mountains themselves—but affected large regions. Such uplifts, where whole sections of the lithosphere were elevated without being folded, are referred to as epeirogenic uplifts, to distinguish them from the uplifts of the folded mountain belts which may have resulted from the folding itself and which are referred to as orogenic uplifts. As to the extent of the resulting changes in sea level, Umbgrove says:. . . The most important question concerns the depth to which the sea-level was depressed in distinct periods of intense regression, in other words, the extent of the change to which the distance between the surface of the continents and the ocean floors was subjected during the pulsating rhythm of subcrustal processes. Joly was the only one who approached this question from the geophysical side, and he arrived at an order of 1000 meters.... (420:95).

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