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post #6 of (permalink) Old 10-15-2012, 08:44 PM Thread Starter
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Join Date: Feb 2012
Location: Southeast Minnesota
Posts: 18
Callyft, I think you nailed it on the head! A couple of google image searches matched what I have with "banded iron formation". Found a good description of the rock contents on one site: "alternating bands of red chert (jasper; cryptocrystalline quartz - SiO2), red hematite (iron oxide - Fe2O3), and silvery-gray specular hematite (iron oxide - Fe2O3)."

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