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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...

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