A Reevaluation of Jurassic Eustasy in the Light of New Data and the Revised Exxon Curve
Published:January 01, 1988
A. Hallam, 1988. "A Reevaluation of Jurassic Eustasy in the Light of New Data and the Revised Exxon Curve", Sea-Level Changes: An Integrated Approach, Cheryl K. Wilgus, Bruce S. Hastings, Henry Posamentier, John Van Wagoner, Charles A. Ross, Christopher G. St. C. Kendall
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A comparison is made between the revised Exxon eustatic curve for the Jurassic, based essentially on seismic stratigraphic analysis of North Sea data, and a new curve derived from more conventional stratigraphic analysis. The two curves are broadly similar in that a secular rise of sea level through most of the period is indicated on which about 17 shorter term cycles are superimposed. Both record notable rises in the Sinemurian, Toarcian, Bajocian, Callovian, Oxfordian, and Kimmeridgian. The Exxon curve, however, misses the important event across the Triassic-Jurassic boundary and underestimates the rate of rise in sea level for a number of cycles. In addition, some supposed eustatic events can be discounted as the consequence of regional tectonics. Tectonic activity involving subsidence and uplift, rather than geoid changes, is thought to be the principal cause of regional distortions of the global picture. There is a need for better quantitative data on the amplitude and rate of changes in sea level.
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Sea-Level Changes: An Integrated Approach
Sea-Level Changes: An Integrated Approach - In October 1985, SEPM sponsored a four-day conference entitled ?Sea-Level Changes ? An Integrated Approach.? The purpose of the conference was to provide a forum for an interdisciplinary exchange of ideas on sea-level changes and to provide an opportunity for integrating various types of evidence in approaching unresolved issues. The conference was successful in bringing together scientists from industry, academia, and government, representing all of the major geosciences disciplines. Presentations of many new papers, plus significant releases of data that were previously held proprietary, provided fertile ground for discussion. This much-cited volume represents the best of the material presented at the conference. Includes the early ?Vail? chart.