From Hematite at Meridiani Planum: Detailed spectroscopic Observations and Testable Hypotheses, Glotch, T.D. et. al, 2-10-2004. (caution, big pdf file).

"While preliminary analysis of the Mini-TES spectra of hematite-rich soils at Meridiani Planum are consistent with a low-temperature formation mechanism it is too early to attribute an aqueous origin to it."

There's this from the same pdf, in the paper entitled "APXS on Mars, Analysis of soils amd rocks at Gusev Crater and Meridiani Planum", Rieder, R. et.al.:

"One feature of the Gusev soil X-ray spectrum is the obviously lower Ti content compared to the other known soils. This variable content in the soils is consistent with the proposition of McLennan [13] of a fractionation of various titanium oxides (ilmenite, titanomagnetite) through sedimentological processes on the Martian surface. The lower content of Ti, Cr, Mn, and Fe in the Gusev soil could be explained by a fractionation of heavy minerals (ilmenite, chromite, titanomagnetite, magnetite) in the soil during the fluvial and aeolian transport on the Martian surface."

Not much, I know. In otherwords, there should be heavier minerals in the soil if they developed in-situ, if there was any kind of transport the heavy minerals would be left behind, both chemically and physically. But there be obvious dunes, etc, so wind transport could account for this. Despite its title, this paper had no information of the tests on Opportunity Outcrop.

Oh, it's all geology for now, always has been, gotta find a rock that might host microbrial fossils before we look for microbrial fossils. I really don't expect anything more than that on Mars. It took a billion years for Earth to get to slime, almost 4 billion to get to life with hard parts suitable for fossilization.