I just know the "Golden Age" stuff after that your on your own ....
Wexxian Timelinehttp://img682.imageshack.us/img682/3051/timeline.pngNaucean TimelinePrehistoric – 0 to 500,000 (500,000 years long)
Stone Age – 500,000 to 550,000 (50,000 years long)
Copper Age – 550,000 to 555,000 (5,000 years long)
Bronze Age – 555,000 to 557,500 (2,500 years long)
Iron Age - 557,200 to 558,200 (1,000 years long)
Medieval Age– 558,200 to 558,700 (500 years long)
Renaissance Age – 558,700 to 558,950 (250 years long)
Exploration Age – 558,950 to 559,150 (200 years long)
Industrial Age – 559,150 to 559, 350 (200 years long)
Flight Age – 559, 350 to 559,700(150 years long)
Emancipation Age– 559,700 to 559,850 (150 years long)
Atomic Age – 559,850 to 559,950 (100 years long)
Rocket Age – 559,950 to 560,050 (100 years long)
Modern Age – 560,050 to 560,100 (50 years long)
Digital Age – 560,100 to 560,150 (50 years long)
Biotech Age – 560,150 to 560,175 (25 years long)
Robotics Age – 560,175 to 560,200 (25 years long)
Nano Age – 560,200 to 560,225 (25 years long)
Galactic Exploration Age - 560,225 to 560,250 (25 years long)
Galactic Colonization Age - 560,250 to 560,275 (25 years long)
Halycon War Age - 560,275 to 560,300 (25 years long)
Necromonicon War Age - 560,300 to 560,350 (50 years long)
Galactic Isolationism Age - 560,350 to 560,400 (50 years long)
Ascension Age - 560,400 to 560,500 (100 years long)
Post Ascension - 560,500 - Present (? years long)
Kazea TimelineUnlisted ? -1700
Imperial Age - 1700-1950
Modern Age - 1950 - 2092
Space Age - 2092 - 2600
Exodus - 2600 - 2689
Post Exodus - 2689 - ?
By overlapping these 3 time lines we do have some cross over events.
Naucean Visit Akaz - 2000 (Kazea Timeline) / 560,230 (Naucean Timeline)
CAB Formation - 560,275 (Naucean Timeline) / Unknown Exact Date (Wexian Timeline)
Halycon War - 560,275 (Naucean Timeline) / 2.5 Units After CAB Formation (Wexian Timeline)
Necromonicon - 560,300 (Naucean Timeline) / 5.5 Units After CAB Formation (Wexian Timeline)
As you can see the Naucean and Wexian timelines do not match up completely. However the Naucean and Kazea timeline can co exist because they do not have more than one over lapping date. Thus Kazea date 0 would be be Naucean date 558,230 or in the Naucean Medieval Age when the Kazea were at Tribal. That's assuming that the Kazea age 0 is their origin.
In short what you need is not a single timeline but separate timelines that sit parallel to each other.
EDIT: Here is also a helpful thread ...
A Brief history of the Galaxy: Timelinehttp://www.gamingsteve.com/blab/index.php?topic=5297.0 FanFic - Event Index http://www.gamingsteve.com/blab/index.php?topic=5249.0