Paleontological Evidence of Varitions in Length of Synodic Month since Late Cambrian

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Science  15 Nov 1968:
Vol. 162, Issue 3855, pp. 792-796
DOI: 10.1126/science.162.3855.792


The values of length of synodic month, obtained from tidally controlled periodical growth patterns in mollusks and stromatolites for several geologic periods, indicate that the deceleration rate of the earth's rotation has not been constant. Two breaks in slope, in the Pennsylvanian and Cretaceous, may be related to changes in distribution of continents, oceans, and adjacent shallow seas.

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