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Hello everybody so while browsing the web looking for fossils I stumble upon lots of onlineshops and auctionsides offering single bones. And I'm always like "how do they know the species/genus?" This is not about whether I buy these Vertebrae or not. And not just about the identification of theses specific vertebrae, but more on the concept of trying to identify single bones using these Vertebrae as an example. Let's give it a go: 1) Offered as a Caudal Vertebrae from Camarasaurus grandis, 10.7″. Age: Upper Jurassic Location: Salt & Pepper Quarry, East Of Dinosaur, Colorado. Formation: Brushy Basin Member, Morrison Formation 2) Offered as a Caudal Vertebrae from Camarasaurus grandis, 12.6″. Age: Upper Jurassic Location: Sutton Quarry, East Of Dinosaur, Colorado. Formation: Brushy Basin Member, Morrison Formation 3) Offered as a Tail Vertebrae from Camarasaurus, 5″ wide x 6 3/4″ Age: Jurassic Location: Wyoming Formation: Morrison Formation 4) Offered as a Vertebrae from Camarasaurus, 5 3/4″ x 9 1/4″ Age: Jurassic Location: Wyoming Formation: Morrison Formation So what did I do? I tried google search for images of a Camarasaurus skeleton. Didn't finde the best picutres though. After looking at this my best guess is that it from the "later" (sorry, don't know the correct english word, marked red) part of the tail. Then I tried to find possible candidates for this bone. CLICK (yep, just wikipedia... but I don't know any scientific papers to search) There are a lot of Sauropod in the Morrison Formation in Colorado and Wyoming, so I honestly don't know if it's possible to name them Camarasaurus. For my uneducated eye this could literally be any Dinosaur Verbetrae. I do know Troodons topic about Dinosaur Anatomy, but it didn't really help me at that point. So my question is: What is your way on identifying single bones and what is the best way to do it? Any help is welcome, thank you so much