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Additional Information

Competing Interests

The author declares that he has no competing interests.

Author Contributions

William G Parker conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any raw data.

Funding

Financial assistance for this project was provided by the Jackson School of Geosciences, the National Park Service and the Petrified Forest Museum Association. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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