Abstract
The concept of orbital forcing of climate has been invoked for a century to explain rhythmic patterns of sedimentation. Since the calculation of variations of insolation with fluctuating orbital parameters by the eponymous Milankovitch, orbitally forced sedimentary sequences have been interpreted from almost all sedimentary environments, including lacustrine, evaporite, fluvial, desert, marginal marine, carbonate ramp, and pelagic. Recognition of orbital cycles in the sedimentary record is based on matching sedimentary-cycle periods with the calculated frequencies of the eccentricity, obliquity, and precession cycles, typically by the techniques of spectral analysis. Controversy surrounding the interpretation of orbitally forced cyclicity results when the data for the interpretations lack sufficient rigor or alternative mechanisms for producing cyclicity can be invoked. Despite some shortcomings, this theory illustrates the power of allocyclic controls on sedimentation and should be included in the curric...
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