07350 - Beautiful 1.06 Inch Chalcedonized Fossil Gastropod Cretaceous Dakhla Pterosaur Sphenopteridae - Sphenopteridae

Sphenopteridae - Sphenopteridae

Platecarpus ptychodon

although octahedral and more complex isometric forms are not uncommon

This new and recent species is only known by a few rests

Its morphology is never slightly flat like that of the main species of Pterosaur

07350 - Beautiful 1.06 Inch Chalcedonized Fossil Gastropod Cretaceous Dakhla Pterosaur Sphenopteridae - SphenopteridaeChaledonized gastropods (specimen at fat left is 3. 0 cm tall) these snail shells have been replaced by translucent, fibrous, microcrystalline quartz (SiO2). This variety of quarz is called chalcedony. Chalcedonization is a variety of silicification. Chalcedonized fossils are uncommon.