Physics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985geosu...7..185r&link_type=abstract
Geophysical Surveys (ISSN 0046-5763), vol. 7, March 1985, p. 185-199.
Physics
1
Earth Core, Earth Movements, Earth Rotation, Fossils, Paleontology, Animals, Growth, Stratigraphy
Scientific paper
It is shown that growth patterns preserved in the accretionary skeletons of fossils can be used to confirm the origin of the earth's current moment of inertia in the Phanerozoic era. The length of day determined from fossils in the later Precambrian-Cambrian period was approximately 19 hr, which suggests that the density differentiation of the earth was approximately complete before the end of the Precambrian. The growing length of day, as well as prior differentiation of oxygenated outer layers of the earth, are found to be prerequisites for the creation of Metazoan accretionary skeletons. It is demonstrated that circadian rhythms of living Metazoa do not readily adapt to environmental cycles of less than about 19 hr. A facies by facies comparison of growth patterns is therefore recommended to confirm the origin of inertia changes in the Phanerozoic era.
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