Strand Quarry, Buffalo County, Wisconsin, USA
Complex structure of fragmentation and replacement in silcrete - a silicified sandy dolostone.
© Bill Cordua
Senn Quarry, Buffalo County, Wisconsin, USA
Coarsely cleavable calcite in dolostone and earthy goethite. The calcite fluoresces yellow in medium wave UV light and yellow to red in short wave U.V. light. The red fluorescing calcite phosphoresces blue in short wave UV light. The tip of a standard rock hammer is for scale.
Bork Quarry, Buffalo County, Wisconsin, USA
Vug with calcite scalenohedra in dolostone bedrock. American 25 cent "quarter" for scale.
© William S. Cordua
High wall of the Senn Quarry, July, 2013. The zone with calcite filled vugs is, unfortunately, about 2/3 of the way up.