Mean atmospheric O2
Geologic Time Scale
Orthoceratites & trilobites
Squid-like Orthoceratites (genus Orthoceras) attempt to make meals of trilobites of the species Asaphus kowalewskii at the bottom of an Ordovician sea 480 million years ago. Also featured is a sea star (AKA starfish), an echinoderm of the class Asteroidea; palm-like Crinoids (AKA sea lilies); Rugosa (AKA Tetracoralla); Favistina stellata coral; and Vauxia sponges.
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