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This occurs because particles of different sizes have a tendency to spontaneously segregate and stratify themselves.
Berthault’s research was published in two papers published by the French Academy of Sciences (Berthault 1986, 1988a), and English translations of these papers were subsequently published in a prominent creation research journal (Berthault 1988b, 1990).
Creation scientists would argue that most of the lamination couplets are not true annual events.
In fact, a plausible explanation for the couplets was presented in the young-earth creationist literature one year prior to Davidson and Wolgemuth’s article.
Davidson and Wolgemuth, however, present a new “spin” on the argument: they claim that the correlation between these “varve” counts and radiocarbon dates (as well as tree-ring counts), proves that the Lake Suigetsu varves are true annual events, thus presenting an unanswerable argument for an old earth.
The Bio Logos Foundation has published a popular-level article by old-earth geologists Gregg Davidson and Ken Wolgemuth presenting arguments for an old earth.
One such argument involves counts of sedimentary laminations (“varves”) within the floor of Japan’s Lake Suigetsu. “SG06, A Fully Continuous and Varved Sediment Core from Lake Suigetsu, Japan: Stratigraphy and Potential for Improving the Radiocarbon Calibration Model and Understanding of Late Quaternary Climate Changes.” Quaternary Science Reviews 36: 164–176.