English: I took this image at the Museum of Northern Arizona in Flagstaff. It depicts plesiosaur gastroliths from the Tropic Shale of Utah.

Photography is accepted: I was looking at a snake outside the museum with a curator and he joked that the snake was copyright, and then said that he was kidding and that photography was okay in and around the museum. I was also walking around with a huge camera in plain sight so photography must be acceptable there.

The image is also available at my flickr account.