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the horns during the preparation process have been fractured and glued again
often prismatic
See also Bruton 1966
the other being bright green malachite
05580 - Great Collection of 4 Pterosaur (Coloborhynchus) Teeth Cretaceous KemKem Beds Olcostephanus the horns during the preparationPrecious collection of four nice teeth of this species of pterosaur. The pterosaurs dentition rests in the Upper Cretaceous in North Africa are relatively common among the fauna which got preserved from those ecosystems around 100 million years ago. However, only two different pterosaur taxons have been described. Mader & Kellner (1999) (Full reference: B. J. Mader and A. W. A. Kellner. 1999. A new anhanguerid pterosaur from the Cretaceous of Morocco.
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