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Storm of Iron proves that wrong immediately. Geneseed was stored on that facility, controlled by the Mechanicus. Mars does not control the geneseed. It simply checks its purity and makes sure that it is free of further mutation.

ToBeWilly wrote:

iproxtaco wrote:Yeah, it is, but what do you expect the Mechanicus to be able to do with the geneseed to manipulate them in some way? Every Chapter has their own, there are numerous other holding sites, Terra likely has gene-banks as well. There's little they could do to harm the Space Marines or the Imperium. Tampering would simple lead to retaliation.

Codex: Space Marine, page 8, 4th paragraph:

On Earth the Adeptus Terra set up genetic banks to produce and store Space Marine gene-seed. These banks were used to provide all new gene-seed for Space Marines. To prevent cross-contamination, the genetic stock of each Legion was isolated and henceforth the new Space Marine Chapters would receive gene-seed only from their own genetic stock. The gene-seed of the Traitor Legions was placed under a time-locked stasis seal, although at the time many believed these danerous gene stocks had been destroyed. By taking direct control of the genetic stocks, the Adeptus on Earth could ultimately control the Space Marines. They alone had the power to destroy or create Space Marine armies at will.

It seems from this bit of fluff all gene-seed must pass through the Adeptus Terra.
That is why I don't believe any is keep outside Earth, or the Space Marines themselves.

You're taking it too literally. Destroy as in destroy the gene-seed bank, declare impure, corrupt, mutated, or anything related in which they find not normal behavior for gene-seed. They also have the power to create Space Marine Chapters if the High Lords deem it appropriate. They alone may have the power to do so, seeing as they are the ones who know best how to handle the genetic stock, but that does not mean they can create and destroy at will without facing repercussions. The Space Marines would never allow any organization have manipulative control over them. They answer to the Emperor and the Emperor only. It is also common/reasonable sense for a chapter to keep at least a small portion of gene-seed somewhere else, where they can watch over it in case anything happens, not saying they would use it before having it checked for purity. It is unwise to keep all your eggs in one basket....literally.

It seems that your not getting my point that geneseed is in care of guarded facilitys across the galaxy and not particularly in the care of Earth nor Mars.

Most of a Chapter's Gene-Seed seems to be kept within the Chapter Fortress, with the Tithed gene-seed going for purity testing and, of course, towards founding new Chapters should the need arise.

The Fall of Vilamus, on page 146 of the Big Rule Book, talks about how the Red Corsairs managed to steal the majority of the Marines Errant Chapter's Gene-Seed from there Fortress Monastery, dooming the Chapter since they'd no longer have sufficient to make enough new Space Marines.

ToBeWilly wrote:

Kanluwen wrote:Earth actually makes less sense than Mars.

Why? The Mechanicus' "Biologis" branch is what performs the purity tests, and they're based on Mars.

There's been mention of two different facilities. What likely happens is that the majority of it is kept on one planet, and the other planet receives the screened and declared pure geneseed.

I disagree. I would imagine since Space Marines were originally created on Earth, all necessary tech is there.
I just don't think that the Imperium would hand over one of its most precious commodities to a soverign entity.
I would believe the Ad Mech's "Biologis" branch would send a team to Earth, if they are in fact the ones that do the test.

Unfortunetly you are up against alot of fluff that says otherwise.

Index astartes/codex space marine clearly says that new chapters are made on Mars
There is clear fluff that states that the tithe is sent to the Adeptus Mechanicus
There is clear fluff thats says that it is the Adeptus Mechanicus that does the testing

And the most important thing to remember is what the Adeptus Mechanicus is, they are in charge of science and technology and what do you think the screening process comes under? Also the Emperor's labs are either destroyed during the heresy, closed, or still being run by the Adeptus Mechanicus, as they were working on Terra/the Moon with the Emperor.

templeorks wrote:It seems that your not getting my point that geneseed is in care of guarded facilitys across the galaxy and not particularly in the care of Earth nor Mars.

Well you aren't wrong, so no one's going to disagree. They're kept in facilities across space, but Terra has genebanks, and so does Mars.

OK but I'm just poniting out that its not just either Earth or Mars so it seems the point is moot.