I have always felt that what we see as mars is actually the cooled mantle of an earlier planet. That planet had the crust blown off prior to 2.1 billion years ago. I have a hunch that the earth impact that created the moon may have been a related to what we now see as Mars.

".....researchers have identified a new class of Martian meteorite that likely originated from the Mars's crust."

As is usually the case, there is no concrete evidence for their assertions, and the word "likely: is just another indefinite which expresses a possibility, with no further evidence unless further investigation into it is conducted.

@PoppaJ
Your assertion is just as good as these meteorite scientists. They can't seem to produce the evidence to theirs either.

Obama_socks is angry no one takes his wild assertions as fact.

Cool. This is ~ 10-100 times the water content of the early mantle composition that the SNC meteorites constrain.

AFAIK SNCs are believed to originate from 3 pockets of mantle upwellings that impactors happened to pop. (Cf the massive shield volcanoes of Olympus & Tarsis for similar near surface pockets.)

This confirms the Phoenix find of near surface permafrost water ice.

@ Poppa_J: Highly unlikely, not tested by any observations. Mars northern deep plane is believed to be a possible result from a glancing impactor, that also could have resulted in the 2 still circling and the 1 deorbited moon observed. But that implies the crust was not wholesale lost.

@ obama_socks: As is usually the case, the evidence is in the paper. Or it wouldn't be published.

If likelihoods can be quantified, they are. Elsewhere such definite qualifications are used (as definitely nothing observed is 0 % uncertain).