[meteorite-list] Question about the chemistry of the Martian atmosphere and Martian meteorites

[Galactic Stone & Ironworks]

Hi List,

The CRE of the various Martian meteorites ranges from just under one
million years to almost twenty million years.  In terms of overall
geologic history, this is a recent window of impact events that has
produced the Martian meteorites in our collections.

Scientists have confirmed the Martian origin of these meteorites by
analyzing trapped atmospheric gases inside the meteorites.  However,
the composition of the trapped gases is being compared against very
recent data (starting with Viking).

Does this mean that the Martian atmosphere has not changed in millions
of years?  Or, do the analyses take into account observed/theorized
changes in the atmospheric chemistry?

I am a little unclear on this.

Best regards,

MikeG
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