Loughborough University Library (Credit: Vijetha Vijayan, distributed via Flickr)

Media Library 2 A 23-million-year-old leaf preserved in an ancient New Zealand lake bed provides a key to past atmospheric conditions.

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2 A 23-million-year-old leaf preserved in an ancient New Zealand lake bed provides a key to past atmospheric conditions.

2 A 23-million-year-old leaf preserved in an ancient New Zealand lake bed provides a key to past atmospheric conditions. (Credit: Jennifer Bannister/University of Otago)

Veins, glands along the pointed teeth, and holes that insects gnawed are all visible.

Credit: Jennifer Bannister/University of Otago

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