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The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
What is Evolutionary History?02:35

What is Evolutionary History?

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Diversity of Archaea II01:24

Diversity of Archaea II

Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Updated: Jun 23, 2026

Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
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Dinosaur diversity and the rock record.

Paul M Barrett1, Alistair J McGowan, Victoria Page

  • 1Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK. p.barrett@nhm.ac.uk

Proceedings. Biological Sciences
|May 1, 2009
PubMed
Summary

Geological biases significantly impact dinosaur diversity curves, with most patterns explained by rock outcrop. Sauropodomorphs show potential evolutionary signals, unlike Ornithischia and Theropoda.

Area of Science:

  • Paleontology
  • Macroevolutionary studies
  • Geological influences on biodiversity

Background:

  • Palaeobiodiversity analysis is crucial for understanding macroevolutionary patterns like mass extinctions and adaptive radiations.
  • Recent studies suggest geological factors and sampling biases, rather than genuine evolutionary events, shape marine invertebrate diversity curves.
  • It remains unclear if similar biases affect diversity estimates for terrestrial taxa, such as dinosaurs.

Purpose of the Study:

  • To investigate whether geological biases affect diversity estimates for terrestrial taxa, specifically Mesozoic dinosaur clades.
  • To compare observed dinosaur genus richness patterns with those predicted by geological factors.
  • To identify potential evolutionary signals in dinosaur diversity curves.

Main Methods:

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  • Compiled genus-richness estimates for three Mesozoic dinosaur clades: Ornithischia, Sauropodomorpha, and Theropoda.
  • Constructed linear models of expected genus richness for each clade, using dinosaur-bearing formations as a proxy for fossiliferous rock outcrop.
  • Compared modelled diversity estimates with observed patterns to assess the influence of geological megabiases.

Main Results:

  • Statistically robust correlations indicate that geological megabiases explain almost all aspects of Ornithischian and Theropod diversity curves.
  • The Sauropodomorph record diverges from modelled predictions, suggesting it may better reflect evolutionary signals.
  • A marked decline in dinosaur genus richness was observed during the late Cretaceous, predating the Cretaceous-Palaeocene extinction event.

Conclusions:

  • Geological sampling biases are a significant factor in dinosaur diversity curves, particularly for Ornithischia and Theropoda.
  • Sauropodomorpha may offer a more reliable record for studying dinosaur evolutionary history due to less apparent geological influence.
  • Dinosaur diversity declined for millions of years before the end-Cretaceous extinction, challenging previous assumptions about their pre-extinction status.