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Mixing it up Bouchard found the rocks in Perseverance to mostly be “members of Endeavour Crater
impact breccia” or Shoemaker Formation. But he did find that the Parral and Mesilla
cobbles had distinctly different compositions when compared to the rest of the valley
rocks. Turns out, Parral is “highly similar” to the Matijevic Formation targets Fullerton
and Azilda, he said, but without any newberries. Parral and Mesilla, he suggested, may
have come from someplace else, “most likely somewhere up-valley,” and then were
transported by an as yet unknown mechanism to their current sites. NASA / JPL-Caltech / UA / NMMNHS / M. Brouchard / L.Crumpler