The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Geological …

Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years ago, when the …

Apr 28, 2023 · The Ordovician System rounded out the threefold division of early Paleozoic rocks (i.e., Cambrian, Ordovician, and Silurian), which are all named for Welsh tribes.

The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago.* During this period, the area north of the tropics was almost …

The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth, in 1879, to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, …

During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest...

May 12, 2025 · The Ordovician is the second period of the Paleozoic Era (542-250 million years ago), preceded by the Cambrian and succeeded by the Silurian, Devonian, Carboniferous and …

The Ordovician Period, spanning approximately 485.4 to 443.8 million years ago, represents the second segment of the Paleozoic Era. This geological interval was a time of significant …

Aug 10, 2012 · The Ordovician* lasted about 45 million years and saw the transition from very primitive to relatively modern life-forms in the seas.

The Ordovician ended with a series of extinction events that, together amount to the second greatest extinction of the Phanerozoic. This was the End–Ordovician extinction event.