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Showing 1 to 2 of 2 for “"Fifth-order cycles"”.
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Correlation and Causes of Fifth Order Cycles Within the Upper Cretaceous Eagle Formation, Bighorn Basin of Wyoming
… sections were used to test the hypothesis that fifth-order cycles are of eustatic origin. Spectral analysis of limited grain size data clearly indicated a strong 41,000-year Milankovitch cycle (the obliquity cycle) along with a well-defined 20,000-year Milankovitch cycle (the precession cycle). …
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Correlation of a Hierarchy of Orbitally Forced Allocycles in the Lower Silurian McKenzie Limestone Member of the Mifflintown Formation, Pennsylvania and Maryland
… occurs as a hierarchically stacked set of allocycles whose causal mechanism is orbital forcing. At five localities in Maryland and Pennsylvania the lower McKenzie Limestone is divisible into two fourth-order (400 ky duration) sequences, which in tum may be divided into four fifth-order (100 ky …