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Our shrinking globe

Kenneth Knight Landes
Our shrinking globe
Bulletin of the Geological Society of America (March 1952) 63 (3): 225-239


The surface of the earth lies at two levels, the basalt-floored ocean basins and the sial-capped continental platforms. These great segments of the earth's crust are in isostatic equilibrium. Adjustment is made to a shrinking interior by subsidence. First to drop are the heavier ocean basins. This condition of disequilibrium is terminated by subsidence of the continental platforms to approximately the same relative levels as before. The subsidence of the ocean basins may appear, in the uppermost rocks of the crust, as a great downfaulted block (Pacific type) or as a downwarp (Atlantic type). Both the continental and the ocean-basin segments are subject to fragmentation and local subsidence. Examples are basins, geosynclines, grabens, and foundered continental border zones.

ISSN: 1050-9747
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 63
Serial Issue: 3
Title: Our shrinking globe
Pages: 225-239
Published: 195203
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1959-017845
Categories: OceanographySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., 1952: discussion by K.O. Emery and M. L. Natland, and reply by author, No. 10, p. 1071-1074
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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