Was there 26-Myr periodicity of extinctions?

Hoffman, Antoni

doi:10.1038/321535a0

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…For instance, the large Popigai crater in Siberia has yielded ages ranging from 30 to 70 million years. Also, the supposed periodicity of extinctions has not been supported by additional data, and has been questioned (Hoffman 1986). …”

Section: Paleobiologic Predictive Elementsmentioning

confidence: 96%

Predictive elements of large-body impacts in geologic history

Smit¹

1997

Geologische Rundschau

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Large-body impacts cannot be predicted, although the probability (size-frequency) of large impacts on the Earth has been worked out, yielding frequencies of the order of one impact of a 1-km body every 500 000 years. Another type of prediction, however, is that forthcoming from the consequences of a large-body impact. Prediction as validation of theory. What can be predicted are the consequences of a large impact, ranging from local and regional ejecta blankets to global climate changes leading to mass extinctions. It is the fulfillment of such predictions that has rendered strength to the impact-extinction theory for the Cretaceous-Tertiary (K/T) boundary, in contrast to predictions attached to widespread volcanism, such as at the Deccan traps in India, or sea-level changes.

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Section: Paleobiologic Predictive Elementsmentioning

confidence: 96%

Predictive elements of large-body impacts in geologic history

Smit¹

1997

Geologische Rundschau

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Testing for Periodicity of Extinction

Raup

Sepkoski

1988

Science

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nisms (Princeton Univ. Press, Princeton, NJ, 1976 27, 193 (1984)].14. The bivalve species common in the feces, Entodesma saxicala, Lyonasia calfotnica, and HiateUa artica, lack snug-fitting valves, except Clinocardum nuttalli. 15. In the bivalve experiments six T. tantiUa (1.1 to 3.2 mm in length) were presented to each of 15 Asemichthys in individual holding tanks. All uneaten bivalves were removed after 4 hours. Ingested bivalves were collected from the feces after 48 hours and examined for punching and survival. 16. The frequency of punching among Lacuna (no sculpture), Margarites (spiral sculpture), andAlvinia (spiral and axial sculpture) did not differ significantly (G test, G = 1.75, P > 0.25, df = 2). Nor were there significant differences in the size of punched versus unpunched shells in each genus (Alvinia, t(91) = 1.60, P > 0.10; Margaritcs, t(30) = 0.228, P > 0.75; Lacuna, t(60) = 0.306, P > 0.75).

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Periodicity in extinction and the problem of catastrophism in the history of life

Sepkoski

1989

JGS

194

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The hypothesis that extinction events have recurred periodically over the last quarter billion years is greatly strengthened by new data on the stratigraphic ranges of marine animal genera. In the interval from the Permian to Recent, these data encompass some 13,000 generic extinctions, providing a more sensitive indicator of species-level extinctions than previously used familial data. Extinction time series computed from the generic data display nine strong peaks that are nearly uniformly spaced at 26 Ma intervals over the last 270 Ma. Most of these peaks correspond to extinction events recognized in more detailed, if limited, biostratigraphic studies. These new data weaken or negate most arguments against periodicity, which have involved criticisms of the taxonomic data base, sampling intervals, chronometric time scales, and statistical methods used in previous analyses. The criticisms are reviewed in some detail and various new calculations and simulations, including one assessing the effects of paraphyletic taxa, are presented. Although the new data strengthen the case for periodicity, they offer little new insight into the deriving mechanism behind the pattern. However, they do suggest that many of the periodic events may not have been catastrophic, occurring instead over several stratigraphic stages or substages.

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Was there 26-Myr periodicity of extinctions?

Cited by 4 publications

References 9 publications

Predictive elements of large-body impacts in geologic history

Predictive elements of large-body impacts in geologic history

Testing for Periodicity of Extinction

Periodicity in extinction and the problem of catastrophism in the history of life

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