This lantern slide is from a collection showing field excavations in Arizona, at the Grand Canyon and other unnamed locations in the Painted Desert.
A collection of newly digitized glass lantern slides, showing early 20th century paleontological digs and the preparation of fossils for display, is now available to the public from the Smithsonian Institution Archives and the National Museum of Natural History. Link from Wired.
Thanks to Matt Vavrek!
