I've outlined some of the more juicy tidbits here. Basically, the year the Eldridge Disaster occurs is denoted in the same way that the year Xenosaga starts is denoted, T.C. (Transcend Christ) 4767. I've double-checked with my copy of the XSI ODM, and all relevant character birthdates check out to match. Xenosaga and Xenogears ended up very different games, but this little stem seems to be the way they both start out, and it makes my little fangirl heart go doki doki.
2001 A.D. - Mankind excavated an Object of Deep Knowledge
This era of history was referred to as "At the end the Messiah appears". This rare prophecy
left behind feelings of fear, and after 1000 years of service mankind entered the beginning of
the third Millennium.
The discovery shook the world. An eye shaped object was discovered in a stratum approximately 3.9 billion years old. From its shape, the object appeared to be artificial. Research Organizations made hypotheses about the object and a public announcement was made to the world.
The geological features from the era of the start of the Earth caused some to believe this
object was the source of all life, an Artificial Panspermia (Pan-Universal Embryo) and...
In the academic world there was a number of hypothesis that started to give it unusual,
romantic and jumbled opinions and speculations about what it was. A flood of them focused on the grounds of existence of the object and what it was. Its existence was puzzling and there were many questions surrounding this artificial creation.
There was a lot of deep confusion surrounding the object and many reckless, blind hypothesis's were made. But this and other hypothesis met their demise. Dating of the object found it to be from 15 billions years ago, confirming the belief that it existed since the beginning of the universe.
The official announcements about the object helped increase the confusion. This object, if not of artificial creation was already from a Godlike domain. Eventually the object, which had magnetic properties was labelled MAM(Magnetic Abnormal Matter) for convenience.
Research on a national scale was conducted on the object but problems arose with the budget, which was eventually frozen.
One group of voluntary researchers continued with very detailed analysis. These researchers gave the object another name. The name was Zohar.
Timeline transitioning from A.D. to T.C.
2510 - A project the scope of the entire world, the Space Emigration Project commences.
15 years ago a national institution was founded that supervised the start of this
project. The name of the era is changed to TC(Transcend Christ), where 365 days per
year remains the norm.
0016 - 16 years ago the National Institution was founded people's wish is being realized.
500 years late an emmigrent fleet leaves the Earth and heads into the abyss of space
on a journey. Earth is taboo after this, it is known as Lost Jeruselum.
(Reasons are unknown, most likely due to sudden change in the environment).
0294 - For roughly 250 years the emmigrent fleet wanders around and discovers a feasible
residence at the M24 Sagitarius star cluster. They land. This planet becomes a
beginning, and the land is christened 'Neo Jerusalem'. Emigrent Management and the
National Institution are reorganized and combined. The first chairman is elected.
With Neo Jerusalem as a starting point, mankind sets its sights to the abyss of space.
0295 - The Star Cluster Federation is started.
New Jerusalem is the principal planet of the Star Cluster Federation.
-4500 Blank Years-
The years Pied Piper occurs in in XS are skipped, but the Immigrant Fleet sure is there, and it sure is almost 4800 years old and still crazy by the time XSI hits.
More timeline, from 24 years prior to the TC year Xenosaga begins, to 15 years prior:
4743 - Through the hand of Archeological Researchers and others, a relic from the Lost
Jerusalem era, MAM(Magnetic Abnormal Matter) is discovered. It was discovered on
a transport freight ship belonging to cosmic wanderers in a Pilgrimage Fleet who
worshiped an ancient religion.
4744 - MAM analysis is resumed.
4750 - Through the MAM analysis process, the Phenomenon Alteration Theory comes into existence.
4751 - Top priority was given to completing research on MAM. Project Zohar is started based this research.
4752 - The cosmic conflict becomes aggravated.
4753 is the year of the Miltian Conflict in Saga. HMM. The XG Perfectworks skips a chunk of years, which I guess were filled in when Saga happened because it was a blank space to play with. MAM seems to have been rediscovered the same year Allen Ridgely is born. MAM in this case appears to be very similar to the Marienkind Zohar Emulator, which is recovered in XSI.
Fast forward to Saga's "two years ago," where the DS game places the disappearance of Ariadne:
4765 - The planet where Project Zohar was destroyed through an accident due to ignorance.
MAM was discovered drifting and was recovered.
This is where the discrepancy between the original XSI and XSI & II DS gets annoying. Monolith did a really good job keeping the timeline with Gears matchy-matchy until they change the date of Ariadne's demise from 4765 to 4767 for the original XSI on the PS2. I'm very interested in seeing the DS game translated, because I'm sure Commander Cherenkov's high-strungedness plays out very differently. Although, I believe in XSI, 4765 is the year of the KOS-MOS Archetype Incident, so there's that, too. Does anyone know if they changed the date for that in the DS game as well?
Here's the last bit of the timeline before Gears gets into Gears-only territory:
4766 - Work on Control System Kadamony and Zohar is finished for the time being.
Kadamony's central element, Persona is developed although the details are unknown.
The Strategic Integration Weapon System Deus is developed to stop the current cosmic
war. Zohar is to be used at its main engine.
4767 - In March Zohar becomes Deus's main engine. Both systems were connected at
NGC6744(Note 1), aka Miktam 04 Beta Immigrant Planet (immigration was taking place at a satellite during construction). That same year, due to unknown reasons there was an
accident and both systems went haywire, invading the environment of Miktam 04 Beta.
Quite an enormous amount of damage was dealt. Deus's amazing and uncontrollable power was such a threat that the military made a great sacrifice to force it into suspended
activity. Afterwards analysis concluded that Deus's core had to be sealed. After an
investigation the Enterprise's Large Space Cruiser Eldridge was commanded by the
military. Approximately 120 million workers, survivors, and colonies were safeguarded
by going on board the Eldridge.
4767 - Midway through the trip Deus (in suspended condition) unexpectedly started up. Deus
was sealed, but it was able to use Zohar to hack into the Eldrige Mainframe, the
Artificial Electronic Brain Raziel. Metastasis mode started and Deus changed the
Eldridge's plan to the Main Planet. Eldridge Captain Shigeyoshi Inoue, of the Research
HQ and also a Special Duty Captain decided to evacuate the ship. He tried to use the
ship's blast plug on the hull, but Deus suppressed it and made its use impossible.
Hidden circuits via the Spinal Shaft were executed(Note 2). This caused the Spinal
Shaft to separate (Note 3). This was done in desperation when facing reality and the
Eldridge lost its mass balance and navigational control. Thus, the Eldridge hurled into
the atmosphere of a nearby planet. Gravity dealt damage to the Eldridge's hull and
blocks of the ship were destroyed. The Eldridge used its emergency navigation during
the collission which saved some of the blocks in the collision. The central hull of the
ship, containing Deus's real form sunk to the bottom of the Ocean. Zohar sank elsewhere [probably at Point Bethlehem -Kat] at many kilos per second. Before that, Zohar separated Kadamony from the ship, which had a soft landing near the coastline of a nearby continent.
Although it's spelled differently, you can definitely recognize Michtam in that second block of info. Michtam/Abraxas in Xenosaga and the Miktam in Gears seem to have tragedy take place on them in different eras and serve to be different points of story. The tragedy with the Gnosis on Michtam occurred in 4747, which has no significant assignment in the Gears timeline.
I have no idea if a thread resembling this on any of the older forums that have come and gone exists, buuuut now I've made this one (WITH MY OWN HANDS), so...uh, ain't this neat? I think it's neat...