The Waukesha Quarry is famous for yielding the Waukesha Lagerstätte, a nice soft-bodied fossil deposit in fine-grained argillaceous dolostones of the Brandon Bridge Formation (Llandoverian, Lower Silurian).  It is located on the western side of Rt. 164, just to the north of the city of Waukesha, Waukesha County, southeastern Wisconsin, USA.

GPS of quarry: 43° 2.038' North, 88° 13.059' West.


The Waukesha Quarry contains several Silurian carbonate units - mostly dolostones (Racine Dolomite, Waukesha Dolomite, Brandon Bridge Formation, Burnt Bluff Group, Wilhelmi Formation).


Waukesha Fault (yellowish-gray rubbly zone in left portion of photo), a high-angle normal fault exposed in a highwall of the Waukesha Quarry.  The rocks making up the highwall are Silurian dolostones.  The hanging wall to the left of the fault has dropped downward.  The footwall on the right side of the fault has moved upward.  The geologists in the lower right corner are examining the Ordovician-Silurian unconformity in the footwall block.



The Ordovician-Silurian boundary interval present in the lower right corner of the above photo can be better seen here.





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