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The map on the left contains potential (red, green) and known (blue) chert outcrops. It is continually being updated. It starts on the Washington County and Louisa County areas because field checks are completed there. Click on the blue polygons to see pictures of known chert (if available). The blue layer contains known and recently visited chert sources. The other layers show potential for chert outcrops but not verified. Click link below this text for bigger version of map on left. Acknowledgement for some sources: Iowa DNR/Geological and Water Survey.