So what is it? In the early 1990's, I was conducting one of our first field trips through the Colorado Plateau region, and at a stop to observe the sediments of the Chinle Formation, one of the students picked up the sample seen in the picture. I am admittedly not a paleontologist, but I looked and looked and couldn't make heads or tails of it. It sat on my desk for seven or eight years, until I walked through the visitor center at Petrified Forest National Park (the park is a showcase for the Chinle Formation), when I got it! Can you?