This is a fossil dugong (Metaxytherium Floridanum) rib section that was recovered from the Peace River in the Bone Valley formation of Florida (Miocene Period, approx. 5-23 million years old). This example still has attached matrix material from when I recovered it. It looks exactly as it did when I pulled it from the ground - except for a very light brushing to remove loose material.
Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. Your purchase will include an ID label.