Skip to Main Content
Book Chapter

The geological extinction record: History, data, biases, and testing

Norman MacLeod
Norman MacLeod
The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Search for other works by this author on:
September 01, 2014

The geological record represents the only source of data available for documenting long-term historical patterns of extinction intensity and extinction susceptibility. Such data are critical for testing hypotheses of extinction causality in the modern world as well as in deep time. The study of extinction is relatively new. Prior to 1800, extinctions were not accepted as a feature of the natural environment. Even after extinctions were recognized to have occurred in Earth's geological past, they were deemed to have played a minor role in mediating evolutionary processes until the 1950s. Global extinction events are now recognized as having been a recurring feature of the history of life and to have played an important role in promoting biotic diversification. Interpretation of the geological extinction record is rendered complex as a result of several biasing factors that have to do with the spatial and temporal resolutions at which the data used to study extinctions have been recorded: fluctuations in sediment accumulation rates, the presence of hiatuses in the stratigraphic sections/cores from which fossils are collected, and variation in the volumes of sediments that can be searched for fossils of different ages. The action of these factors conspires to render the temporal and geographic records of fossil occurrences incomplete in many local stratigraphic sections and cores. In some cases, these stratigraphic and sampling uncertainties can be quantified and taken into account in interpretations of that record. However, their effects can never be eliminated entirely. Testing hypotheses of global extinction causality requires acknowledgment of the uncertainties inherent in extinction data, the search for unique predictions of historical patterns of variation or associations that can, in principle, be preserved in the fossil record and tied logically to the operation of specific causal processes, and to adoption of an explicitly comparative approach that establishes the presence of multiple instances of the predicted cause-effect couplets within a well-documented chronostratigraphic context.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables


GSA Special Papers

Volcanism, Impacts, and Mass Extinctions: Causes and Effects

Gerta Keller
Gerta Keller
Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
Search for other works by this author on:
Andrew C. Kerr
Andrew C. Kerr
School of Earth and Ocean Sciences, Cardiff University, Park Place, Cardiff CF10 3AT, Wales, UK
Search for other works by this author on:
Geological Society of America
ISBN print:
Publication date:
September 01, 2014



A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Book Content
This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now