Punctuated anagenesis and the importance of stratigraphy to paleobiology
10.1017/s0094837300010472
Crossref journal-article
Cambridge University Press (CUP)
Paleobiology (56)
Abstract

The depositional history of Upper Miocene through Recent sediments from DSDP Site 214 (Ninetyeast Ridge, Indian Ocean) is reexamined. Samples of the Globorotalia tumida planktic foraminiferal lineage, originally obtained from these sediments by Malmgren et al. (1983), serve as the empirical basis for the recognition of punctuated anagenesis as a distinct mode of phenotypic evolution and have been the subject of numerous additional investigations. However, conclusions reached by previous authors depend strictly on the validity of the original chronostratigraphic interpretation of these sediments. Graphic correlation analysis of first- and last-appearance datum levels for a total of 41 planktic foraminiferal, radiolarian, and calcareous nannoplankton taxa provides evidence for a more complex depositional history at this deep-sea site than originally believed. Based on a conservative model of variation in the pattern of sediment accumulation rates, the lowermost portion of the studied section (6.5-4.3 Ma) represents an interval of temporally condensed sediment accumulation (1.88 cm/1,000 yr) followed by an interval (4.3-2.8 Ma) of temporally expanded sediment accumulation (3.97 cm/1,000 yr). This interval, in turn, is followed by a depositional hiatus or an extremely condensed interval, at least 800,000 yr in duration, which is followed by another relatively condensed (1.36 cm/1,000 yr) interval from 2.0 Ma-Recent. Although this chronostratigraphic reinterpretation deviates substantially from the original, which recognized Site 214 as being both temporally continuous and exhibiting a constant sediment accumulation rate from the Upper Miocene through the Upper Pliocene, it is more consistent with expectations based on Neogene eustatic sea-level fluctuations and global surveys of Neogene hiatus distributions. Age assignments for samples of the Gr. tumida lineage based on the revised chronostratigraphic model reverse some findings of previous investigators with respect to the distinctiveness of phenotypic evolutionary rates characterizing the transition from Gr. plesiotumida to Gr. tumida. Finally, a brief survey of similar marine invertebrate lineage studies shows that changes in the rate of phenotypic evolution often appear to coincide with major physical changes in the paleoceanographic environment. Such correspondences may be due, at least in part, to the effect of these environmental changes on sediment accumulation rates. Paleobiologists who seek to understand patterns of phenotypic change over time must remove the effects of variations in sediment accumulation rates from their data before evolutionary hypothesis testing and remain aware of the limitations imposed on their interpretations by the uncertain nature of chronostratigraphic inference.

Bibliography

MacLeod, N. (1991). Punctuated anagenesis and the importance of stratigraphy to paleobiology. Paleobiology, 17(2), 167–188.

Authors 1
  1. Norman MacLeod (first)
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Dates
Type When
Created 9 years ago (July 26, 2016, 10:06 p.m.)
Deposited 6 years, 3 months ago (May 18, 2019, 11:14 a.m.)
Indexed 3 days, 12 hours ago (Aug. 21, 2025, 2:18 p.m.)
Issued 34 years, 7 months ago (Jan. 1, 1991)
Published 34 years, 7 months ago (Jan. 1, 1991)
Published Online 9 years, 6 months ago (Feb. 8, 2016)
Published Print 34 years, 7 months ago (Jan. 1, 1991)
Funders 0

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@article{MacLeod_1991, title={Punctuated anagenesis and the importance of stratigraphy to paleobiology}, volume={17}, ISSN={1938-5331}, url={http://dx.doi.org/10.1017/s0094837300010472}, DOI={10.1017/s0094837300010472}, number={2}, journal={Paleobiology}, publisher={Cambridge University Press (CUP)}, author={MacLeod, Norman}, year={1991}, pages={167–188} }