Graptolites are the most important index fossils in these metamorphic rocks. Continuous Ordovician sections in Yongxin and Chongyi Counties, ... Chen X, Zhang Y D, Fan J X, Cheng J F and Li Q J.

The Liexi Fauna was discovered in the Madaoyu Formation of the Lower Ordovician. The conodont and graptolite assemblages indicate a mid-Florian, Early Ordovician age, making it slightly younger ...

Long before the dawn of humans, dinosaurs, insects or even trees, a cascade of unfortunate events threatened to end life on earth. During the Ordovician Period, around 485 to 444 million years ago, ...

A newfound fossil of a jawless fish is the oldest known vertebrate cranium preserved in 3D. The 455 million-year-old find could illuminate how vertebrate heads evolved.

The fossil arrived at Harvard in 2019, amid a collection of legally imported invertebrate fossils from the Fezouata Shale, a formation full of exquisitely preserved Ordovician fossils from the ...

The newfound fossils also offer an unparalleled glimpse into a dynamic chapter of evolution called the great Ordovician biodiversification event. “This is when life started to get really ...

A newfound fossil of a jawless fish is the oldest known vertebrate cranium preserved in 3D. The 455 million-year-old find could illuminate how vertebrate heads evolved.