. Bulletin of the Geological Society of America. Geology. BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 33, PP. 337-352 JUNE 30, 1922 ISOSTATIC COMPENSATION CONSIDERED AS A CAUSE OF THKUSTING 1 BY ANDREW C. LAWSON {Presented in abstract before the Society December 29, 1921) CONTENTS Page The limits of length of overthrust blocks 337 The limits of movement of overthrust blocks 341 Underthrusting 344 Compensatory flow and underthrusting 349 The Limits of Length of overthrust Blocks If a rupture plane of low dip exist in the earth's crust emergent at the surface, and if a stress exist in the
. Bulletin of the Geological Society of America. Geology. BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 33, PP. 337-352 JUNE 30, 1922 ISOSTATIC COMPENSATION CONSIDERED AS A CAUSE OF THKUSTING 1 BY ANDREW C. LAWSON {Presented in abstract before the Society December 29, 1921) CONTENTS Page The limits of length of overthrust blocks 337 The limits of movement of overthrust blocks 341 Underthrusting 344 Compensatory flow and underthrusting 349 The Limits of Length of overthrust Blocks If a rupture plane of low dip exist in the earth's crust emergent at the surface, and if a stress exist in the overlying prism which tends to move it toward the emergent side, the movement is restrained by the friction of the surfaces in contact on the rupture plane. If, further, the stress. Figure 1.—Diagrammatic Representation of a Thrust Block AB, surface of the earth ; BC, thrust plane. be due to a pressure applied from without to the cross-section of the prism, then, in order that the prism may move, and so be thrust over the underlying rock-mass, the pressure must exceed the friction on the rup- ture plane. If the stress be tangential in direction and uniformly dis- 1 Manuscript received hy the Secretary of the Society November 14, 1921. This paper is one of a series composing a symposium on isostasy. In the absence of the author, it was presented by H. F. Reid. XXII—Bull. Geol. Soc. Am., Vol. 33, 1921 (337). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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