Datura quids at Pinwheel Cave, California, provide unambiguous confirmation of the ingestion of hallucinogens at a rock art site

David Robinson^*, Kelly Brown, Moira McMenemy, Lynne Dennany, Matthew Baker, Pamela Allan, Caroline Cartwright, Julienne Bernard, Fraser Sturt, Elena Kotoula, Christopher Jazwa, Kristina Gill, Patrick Randolph-Quinney, Thomas Ash, Clare Bedford, Devlin Gandy, Matthew Armstrong, James Miles, David Haviland