| 21. | Much more commonly, it contains trace fossils, especially the tetrapod footprints of " Chirotherium ".
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| 22. | Trace fossils have been found in the Willwood Formation.
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| 23. | Most trace fossils are burrows of molluscs or arthropods.
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| 24. | Most trace fossils are usually readily identified by reference to similar phenomena in modern environments.
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| 25. | Also found in the Owl Rock are trace fossils of cylindrical burrows and fossils of ostracodes.
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| 26. | Tetrapod footprints, worm trails and the burrows made by clams and arthropods are all trace fossils.
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| 27. | Trace fossils can also provide insight into behavior.
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| 28. | The second floor holds a variety of invertebrates, trace fossils, minerals, and exhibits on local geology.
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| 29. | The only known fossils from this time period is the tube-shaped trace fossil " Skolithos ".
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| 30. | The Yerrapalli Formation preserves fossils of freshwater and terrestrial vertebrates as well as trace fossils of invertebrates.
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