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Growth rhythms in the brachiopod Rafinesquina alternata from the Late Ordovician of southeastern Indiana

Published online by Cambridge University Press:  08 April 2016

Gary D. Rosenberg
Gary D. Rosenberg*
Affiliation:
Department of Geology, Indiana/Purdue University at Indianapolis, Indianapolis, Indiana 46202
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Abstract

Growth rhythms are described in the accretionary skeletons of Rafinesquina alternata, a Late Ordovician brachiopod from southeastern Indiana. Contiguous growth increments widen and narrow in repeating series, giving the appearance of adjacent clusters of increments. Fourier analyses of growth increment widths and counts of the number of increments within individual clusters yield similar periodicities. Increments vary in width over a period of approximately 19 increments, modulated with a lower amplitude oscillation of 27 increments. The number of increments per cluster falls into two groups; clusters having between 8 and 17 increments outnumber those having between 18 and 30 increments.

All specimens were obtained from a Maysvillian facies of the Dillsboro Formation, previously inferred to represent a shallow subtidal environmental setting. The growth periodicities described here are consistent with this interpretation. The intensity of tidal parameters such as emersion-immersion cycles, substrate shifts, changes in nutrient supply or in oxygen tension declines with depth as would the number of growth increments added each month in response to these factors. Thus, for these specimens, the maximum number of increments per cluster probably approximates the true number of “tidal” days in the Late Ordovician synodic month (period between full moons).

The paleoecological model derived from these analyses can be used in future studies to predict the rate of the earth's rotation and the motion of the moon in the Late Ordovician and, equally importantly, to evaluate the limits of uncertainty of such studies.

Type
Articles
Information
Paleobiology , Volume 8 , Issue 4 , Fall 1982 , pp. 389 - 401
Copyright
Copyright © The Paleontological Society 

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References

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