The Ordovician 505 to 440 Million Years Ago The Ordovician period began approximately 510 million years ago, with the end of the Cambrian, and ended around 445 million years ago, with the beginning of the Silurian. At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana. Throughout the ...

Paleontological exhibit of Ordovician, Trentonian, fossil fauna of Green Bay and De Pere, Wisconsin, is an educational resource for professional and amateur paleontologists and fossil collectors ...