Notes: 1  In 1997, MLB retired Jackie Robinson's number 42 meaning no other player in MLB could ever wear it. However, it was grandfathered to anyone who was currently wearing the number. 2  Mariano Rivera is the only Yankee to appear as an active player while wearing his retired number.
The Ordovician Period. 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 entirely ocean, and most of the world's land was collected into the southern supercontinent Gondwana.
In the modern Greek school-books, ancient times is a period of about 1000 years (from the catastrophe of Mycenae until the conquest of the country by the Romans) that is divided in four periods, based on styles of art as much as culture and politics.The historical line starts with Greek Dark Ages (1100-800 BC).he history of Ancient Greece is often taken to end with the reign of Alexander the Great, who died in 323 BC. Subsequent events are described in Hellenistic Greece. Any history of Ancient Greece requires a cautionary note on sources.