Corios

Corios is a genus of fossil ammonites, extinct marine mollusks belonging to the order Ammonoidea. These cephalopods lived during the Late Cretaceous period, approximately 100 to 66 million years ago. The genus Corios is characterized by its distinctive shell morphology, often exhibiting a moderate to high degree of coiling and specific ribbing patterns. The shell sutures, which are the lines where the internal walls of the shell meet the external shell, are typically complex, reflecting a trait common among many ammonites of this era.

Fossils of Corios have been found in various marine sedimentary rock formations around the world, indicating a widespread distribution during their existence. The specific geological contexts where these fossils are discovered provide valuable information about the ancient marine environments they inhabited. Paleontologists study Corios, like other ammonites, to understand evolutionary relationships within the Ammonoidea, to reconstruct past ecosystems, and to use them as biostratigraphic markers for dating rock layers. The precise classification and placement of Corios within the larger ammonite family tree can be subject to ongoing research and refinement as new fossil evidence emerges and analytical techniques improve.