Discs

Clicking on the images will display larger versions of the photos.

	SEM image (5500x) of small "iron nodules" (EDS analysis) on calcium carbonate. Some evidence of corrosion pits. Sample (SW3) is of salmon-colored chunks of rock from the corrosion residue in the FN survey near FNH2 on the way to Big Sky camp. Photo by Spilde, Northup, and Boston.
	Closeup SEM image (16,000x) of the "iron nodules" in the preceding image. The size and collapsed look suggest that these could be bacteria. Photo by Spilde, Northup, and Boston.
	SEM image (1000x) overview of the preceding two images. Photo by Spilde, Northup, and Boston.
	SEM closeup image (27,000x) of the iron oxide nodules located in the pit in the preceding image from a rock sample of the red-colored rock wall in an area of heavy corrosion residue in the EA survey. Photo by Spilde, Northup, and Boston.
	SEM image of close-up of putative iron oxide formations. EDS analysis noted the presence of Fe, O, Ca, and Al. Photo by Spilde, Northup, and Boston.

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