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This is a sauropod tooth from Irhazer formation, Niger. It measures almost 2 inches from tip to base, and the widest part measures 0.9 inches. The seller mentioned this tooth may be a Jobaria, but there is no Jobaria have been described from the Irhazer formation. The Irhazer formation underlies the Tioraren formation where Jobaria was reported. The only spoon-shaped teeth sauropod known from the Irhazer formation is Spinophorosaurus, but the teeth has no serration on it. According to the paper 'Sauropod Tooth Morphotypes from the Upper Jurassic of the Lusitanian Basin (Portugal)' , the tooth looks very similar to the compressed-cone chisel tooth, which attributed to macronarian or basal titanosauriforms. http://novataxa.blogspot.com/2017/03/sauropod-teeth-jurassic-portugal.html base of the tooth
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