Late Proterozoic and Paleozoic Tides, Retreat of the Moon, and Rotation of the Earth

Details Late Proterozoic and Paleozoic Tides, Retreat of the Moon, and Rotation of the Earth Late Proterozoic and Paleozoic Tides, Retreat of the Moon, and Rotation of the Earth

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...273..100s&link_type=abstract

Science, Volume 273, Issue 5271, pp. 100-104

Physics

26

Scientific paper

The tidal rhythmites in the Proterozoic Big Cottonwood Formation (Utah, United States), the Neoproterozoic Elatina Formation of the Flinders Range (southern Australia), and the Lower Pennsylvanian Pottsville Formation (Alabama, United States) and Mansfield Formation (Indiana, United States) indicate that the rate of retreat of the lunar orbit is dξ/dt ~ k_2 sin(2δ) (where ξ is the Earth-moon radius vector, k_2 is the tidal Love number, and δ is the tidal lag angle) and that this rate has been approximately constant since the late Precambrian. When the contribution to tidal friction from the sun is taken into account, these data imply that the length of the terrestrial day 900 million years ago was ~ 18 hours.

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