Upper Jurassic Period

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Mesadactylus ornithosphyos

 

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Mesadactylus (Mesa finger)
Several associated bones including wing bones, vertebrae, pectoral girdle, synsacrum and femurs from the Upper Jurassic strata of Colorado, USA.  The cervical vertebrae are very pneumatic.

Jensen, J. A. & Padian, K. 1989, Small pterosaurs and dinosaurs from the Uncompahgre fauna (Brushy Basin Member, Morrison Formation: ?Tithonian), late Jurassic, western Colorado.J. Paleont. 63, 363–374.