A recent study shows that marine oxygen levels were crucial to the evolution of early Paleozoic trilobite body size, ...

Fig.1: Tempo and mode in the body size evolution of Cambrian-Ordovician trilobites. Changes in maximum size (red) and mean size (blue) for each time slice, with lines and shading representing the ...

Fig. 4: Cambrian and Ordovician trilobite body size (A) and their correlation to the inferred oxygen levels (B) and temperature (C). (B) Ocean redox conditions and widespread anoxic intervals ...

There, he and his companion collected a remarkable diversity of new trilobite species that they found in rocks from the Ordovician period (between 485 and 444 million years ago) — the perfect ...

Trilobites Scavenging Animation A 3D animation of extinct Trilobites scavenging on the seafloor. ordovician period stock videos & royalty-free footage A 3D animation of extinct Trilobites scavenging ...

Fast forward some 73 million years to the end of the next geologic period (the Ordovician), and life meets its first bust. The first of five (or possibly six) mass extinctions in Earth history ...