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estimated to range from as little as <25 m       and its occurrence in the Jurassic as well             Frakes, L.A., Francis, J.E., and Syktus, J.I., 1992,
for minor falls, to as much as ~150 m for        as other periods supports the conclusion                  Climate modes of the Phanerozoic: The history
major falls. The average duration of the         that the 410-k.y. periodicity may be consid-              of the Earth’s climate over the past 600 million
third-order events is just over a million        ered as a basic element of most sequences,                years: Cambridge, Cambridge University Press,
years, while fourth-order events average at      controlled largely by the long-term cli-                  274 p., https://doi.org/10.1017/CBO9780511-
~410 k.y. Much like the Cretaceous (see          matic trends.                                             628948.
Haq, 2014), the fourth-order cyclicity also
seems to be a common feature in the              ACKNOWLEDGMENTS                                        Gurnis, M., 1993, Phanerozoic marine inundation
Jurassic and is observable locally in sec-                                                                 of continents driven by dynamic topography
tions with relatively high sedimentation            This paper is dedicated to the memory of a             above subducting slabs: Nature, v. 364, p. 589–
rates. This higher-order cyclicity is consid-    fellow paleoceanographer and friend, Wolfgang             593, https://doi.org/10.1038/364589a0.
ered to represent the long-period orbital        Berger, a scientist extraordinaire, who generously
eccentricity control on depositional cycles.     shared his insights with all his colleagues. The       Gygi, R.A., Coe, A.L., and Vail, P.R., 1998,
                                                 author extends his thanks to Mathieu Martinez             Sequence stratigraphy of the Oxfordian and
DISCUSSION AND CONCLUSIONS                       and Guillaume Dera for providing the stable iso-          Kimmeridgian stages (Late Jurassic) in northern
                                                 topic data on European belemnites from the                Switzerland, in De Graciansky, P.-C., Hardenbol,
  The causes for third-order cyclicity in        Jurassic. Special thanks are due to James Ogg,            J., Jacquin, T., and Vail, P.R. eds., Mesozoic and
the Jurassic, in a period where there is little  and two anonymous reviewers, for the detailed             Cenozoic Sequence Stratigraphy of European
direct evidence of major ice sheets, remain      review and many suggestions that improved this            Basins: Tulsa, Oklahoma, SEPM Special
unresolved (see a discussion in Haq and          paper. Thanks are also due to Alexandre Lethiers          Publication 60, p. 3–29.
Huber, 2016). A variety of solid-Earth tec-      (University of Pierre and Marie Curie, Paris) for
tonic influences can affect sea-level            carefully drafting the sea-level curves through        Hallam, A., 1978, Eustatic cycles in the Jurassic:
changes (see, e.g., Conrad, 2013; Haq,           several iterations.                                       Palaeogeography, Palaeoclimatology, Palaeo­
2014). But these influences can only pro-                                                                  ecology, v. 23, p. 1–32, https://doi.org/10.1016/
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