So it seems that dinosaurs ate hallucinogenic fungus growing on prehistoric grass that was then preserved for about 100 million years in an amber fossil.
A perfectly preserved amber fossil from mines in Myanmar, previously known as Burma, that provides evidence of the earliest grass specimen ever discovered. The fossil was topped by a fungus similar to ergot, which for eons has been intertwined with animals and humans.
Amber begins as a tree sap that can flow around small plant and animal forms and permanently preserve them, as it fossilizes into a semi-precious stone. Poinar is a world leader in examining such specimens and using them to learn more about prehistoric ecosystems.