Fossil leaf (Betula sp.) from the Eocene,found in Colorado. Trees of this genus developed during the Tertiary Period and are still common today (birches) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biophoto Associates |
Taille de l’image : | 5143 px × 3395 px |
Model Release : | Non requis |
Restrictions : |
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