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7 results on '"Smith, Andrew B"'

1. Palaeoanatomy and biological affinities of a Cambrian deuterostome (Stylophora)

Author

Clausen, Sebastien and Smith, Andrew B.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Sébastien Clausen (corresponding author) [1]; Andrew B. Smith [2] Stylophora are a peculiar extinct group of asymmetrical deuterostomes whose biological affinity has been fiercely debated [1, 2, 3, 4, [...]

Published
2005
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4. The Adequacy of the Fossil Record

Author

Smith, Andrew B.

Subjects
The Adequacy of the Fossil Record (Book) -- Book reviews, Books -- Book reviews, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1998

7. Is the periodicity of extinctions a taxonomic artefact?

Author

Patterson, Colin and Smith, Andrew B.

Abstract

The evidence that extinctions since the mid-Permian show periodicity of ˜26 million years rests primarily on the stratigraphic ranges of marine families. We have checked the echinoderm and fish families which together make up about 20% of the data. Only 25% of these fish and echinoderm extinctions are real (disappearance of a monophyletic group). The remaining 75% is noise, chiefly 'extinctions' of non-monophyletic groups, mistaken dating, and 'families' containing one species only. The signal-to-noise ratio is very similar in echinoderms (27:73) and fishes (23:77). Periodicity in our sample is a feature of the noise component, not of the signal.

Published
1987
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