The Ordovician lasted for 47 million years from 490 to 443 Million Years Ago.
490 million years ago.
The Ordovician era (~488.3 to 443.7 million years ago) was named for the Ordovices, a Celtic tribe.
About 44 million years
The Ordovician period came first. It started 485.4 million years ago and finished 443.8 million years ago. Then came the Silurian and Devonian periods, followed at 358.9 million years ago by the Carboniferous.
The Ordovician Period started about 488.3 ± 1.7 Ma (million years ago), and lasted for about 44.6 million years. For more details, see the Related Link below.
470 million years ago was in the Ordovician Period (488.3 - 443.7 Ma).Phanerozoic Eon (542 Ma - Now)Paleozoic Era (542 - 251Ma)Ordovician Period (488.3 - 443.7Ma)Middle Ordovician Epoch (471.8 - 460.9Ma)Dapingian Age (471.8 - 468.1Ma)
The Appalachian Mountain range was created during the middle Ordovician Period (about 496-440 million years ago).
Ordovician 4000 to around 4600 million years ago
The Silurian is a geologic time period of the early Paleozoic. The Silurian was approximately 440 million years ago, to 416 million years ago. The Silurian was the period immediately after the Ordovician.
They are both time periods of the early Paleozoic. The Ordovician was approximately 490 million years ago, to 440 million years ago. The Silurian was approximately 440 million years ago, to 416 million years ago. The Silurian was the period immediately after the Ordovician. The two periods were divided by the second largest Mass extinction in history.